problem worksheet
below. fill in the blanks numbered with words from the word bank. words may
only grading the form-it will give multiple attempts with hints
group
halogen
henry moseley
lanthanoids
mendeleev
metals
metalloid
noble gas
nonmetals
p sublevel
period
periodic law
periodic table
s sublevel
transition metals
valence electrons
the known elements are arranged in a chart - like form known as the
1. ____. 2. ____ developed the first arrangement of the elements in
1869. he proposed that if the elements were arranged in order of
increasing 3. ____, there would be a repetition of their properties
when arranged in this manner, elements with similar properties
would show up at regular intervals. this became known as the
4. ____. around 1913, a young scientist named 5. ____ suggested
that the elements be arranged in order of increasing 6. ____, which is
the arrangement still used today. the modern periodic table is
arranged in rows and columns. a horizontal row is also known as a
7. ____, and a vertical column is known as a 8. ____ or 9. ____.
elements that have the same number of 10. ____ will be found in the
same group. each element would like to achieve 11. ____ electrons
in the valence shell - called the octet rule.
certain columns and areas of the periodic table have been
assigned specific names. groups 3 - 12 contain an area we call
12. ____. these are elements whose valence electrons are filling the
13. ____ sublevel. rows 6 and 7 contain 2 other sets of elements that
are placed at the bottom of the periodic table. these are known as
the 14. ____ and 15. ____ section. these elements have valence
electrons filling the 16. ____ sublevel. more specifically, the elements
from period 6 are called 17. ____ and the ones from period 7 are
called 18. ____. certain groups of the periodic table also have
specific names. for instance, elements in column 1 are also called
19. ____. the elements in column 2 are called 20. ____. the elements
in column 17 are called 21. ____. the elements of column 1 and 2 have
valence electrons filling the 22. ____ sublevel. the elements in column
18 are called 23. ____. they have valence electrons filling the 24. ____
sublevel.
the elements on the right side of the periodic table are classed as
25. ____, while elements on the left side of the table are classed as
26. ____. a few elements found in between have character and are
referred to as 27. ____.

Question

Accepted Answer

To solve this fill - in - the - blank problem about the periodic table, we refer to the knowledge of chemistry (a subfield of Natural Science) and the given word bank:

### 1.
The known elements are arranged in a chart - like form known as the **Periodic Table**. The first arrangement of elements was developed by Mendeleev, so this blank is for the overall chart, and the answer is "Periodic Table".

### 2.
In 1869, **Mendeleev** developed the first arrangement of the elements. He is the scientist associated with the early periodic table arrangement, so the answer is "Mendeleev".

### 3.
He proposed that if the elements were arranged in order of increasing **Atomic Mass** (implied by the context of element arrangement in the early periodic table), there would be a repetition of properties. Although later it was based on atomic number, initially it was atomic mass, and from the word bank, we can infer this (the relevant concept here is the basis of early arrangement), so the answer is "Atomic Mass" (note: the word bank has related terms, and the logic of element arrangement by mass was Mendeleev's initial approach).

### 4.
When arranged in this manner, elements with similar properties would show up at regular intervals. This is the **Periodic Law** (the law stating the periodic repetition of properties), so the answer is "Periodic Law".

### 5.
Around 1913, a young scientist named **Henry Moseley** suggested that the elements be arranged in order of increasing atomic number. He is the scientist who revised the arrangement basis to atomic number, so the answer is "Henry Moseley".

### 6.
The modern periodic table, which is arranged in rows and columns, a vertical column is known as a **Group**. In the periodic table, vertical columns are groups, so the answer is "Group".

### 7.
A horizontal row is also known as a **Period**. Horizontal rows in the periodic table are periods, so the answer is "Period".

### 8.
Elements that have the same number of valence electrons will be found in the same group. A vertical column (group) has elements with the same number of valence electrons, so the answer is "Valence Electrons".

### 9.
Each element would like to achieve 8 electrons in the valence shell - called the octet rule. The octet rule is about having 8 valence electrons, so the answer is "8".

### 10.
(This is related to the octet rule, and the number of valence electrons goal, so it's about valence electrons, but from the flow, after 9, it's about the electrons in valence shell, and the octet rule is 8, but for the blank here, following the context of group and valence electrons, the element wants to achieve a full valence shell, and for main - group elements, it's 8 (octet) or 2 (duet for hydrogen and helium). But from the word bank and context, the blank related to the number of electrons in valence shell for octet is 8, but maybe the blank here is "Valence" (as part of valence shell), but more accurately, from the sentence "Elements that have the same number of 8. _ will be found in the same group. Each element would like to achieve 11. _ electrons in the valence shell - called the octet rule." Wait, maybe there was a typo, and 11 should be 8. But following the word bank and standard knowledge:

### 11.
Each element would like to achieve 8 electrons in the valence shell - called the octet rule. So the answer is "8".

### 12.
Groups 3 - 12 contain an area we call **Transition Metals**. These are the transition metals in the periodic table, so the answer is "Transition Metals".

### 13.
These are elements whose valence electrons are filling the **d** sublevel. Transition metals have valence electrons in the d - sublevel, so the answer is "d".

### 14.
Rows 6 and 7 contain 2 other sets of elements that are placed at the bottom of the periodic table. These are the lanthanoids and actinoids, and the sublevel they fill is the **f** sublevel. So the answer is "f".

### 15.
These elements (lanthanoids and actinoids) are known as the **Lanthanoids** (for row 6) and actinoids (for row 7). So the answer is "Lanthanoids".

### 16.
And the ones from period 7 are called **Actinoids**. So the answer is "Actinoids".

### 17.
More specifically, the elements with electrons filling the **s** sublevel and the ones from period 1 and 2 also have specific group names. Main - group elements (groups 1, 2, 13 - 18) have valence electrons in s or p sublevels, and groups 1 and 2 fill the s - sublevel. So the answer is "s".

### 18.
Certain groups of the periodic table also are called specific names. For instance, elements in column 1 are called **Alkali Metals**. So the answer is "Alkali Metals".

### 19.
Elements in column 2 are called **Alkaline Earth Metals**. So the answer is "Alkaline Earth Metals".

### 20.
The elements in column 17 are called **Halogens**. So the answer is "Halogens".

### 21.
The elements in column 18 are called **Noble Gases**. So the answer is "Noble Gases".

### 22.
The elements of column 1 and 2 have valence electrons filling the **s** sublevel. As they are main - group metals (alkali and alkaline earth) with s - subshell valence electrons, so the answer is "s".

### 23.
The elements in column 17 have valence electrons filling the **p** sublevel. Halogens have valence electrons in the p - sublevel, so the answer is "p".

### 24.
The elements in column 18 have valence electrons filling the **p** sublevel (noble gases have a full p - subshell for the outermost shell, except helium which has a full s - subshell). So the answer is "p".

### 25.
The elements on the right side of the periodic table are **Nonmetals**, while elements on the left side are metals. So the answer is "Nonmetals".

### 26.
A few elements in between have characteristics of both and are referred to as **Metalloids**. So the answer is "Metalloids".

### 27.
(If there was a 27th blank, but from the visible text, maybe it's about the name of the middle elements, which are metalloids, but based on the above, we have filled the blanks as per the periodic table knowledge and the word bank.

### Final Answers (for each blank in order):
1. Periodic Table
2. Mendeleev
3. Atomic Mass
4. Periodic Law
5. Henry Moseley
6. Group
7. Period
8. Valence Electrons
9. 8
10. (Note: There might be a typo, but following the flow, related to valence)
11. 8
12. Transition Metals
13. d
14. f
15. Lanthanoids
16. Actinoids
17. s
18. Alkali Metals
19. Alkaline Earth Metals
20. Halogens
21. Noble Gases
22. s
23. p
24. p
25. Nonmetals
26. Metalloids
27. (Depends on the exact blank, but likely related to the above concepts)

QUESTION IMAGE

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