Question

c. tin (atomic number 50) has isotopes with the following atomic masses. on the lines provided write the number of neutrons found in each of these isotopes. 120 ____ 110 __ 130 __ 118 __ 124 __ 109 __ 3 the electron cloud a. identify the symbols that are used to represent the following elements. hydrogen __ oxygen __ carbon __ sodium __ b. identify the elements that are represented by the following symbols. n __ hg __ mg __ al __ c. complete the following sentences. 1. an __________ is not solid but is composed of several small particles. 2. protons are particles with __________ charges and are found in the atoms center or __________. 3. __________ have the same mass as protons but no electrical charge. they are also located in the atoms __________. 4. electrons are very light particles that circle the __________. 5. electrons have a __________ charge. 6. the __________ tells how many protons or electrons an atom has. 7. the __________ is the combined mass of the neutrons and protons in the nucleus. 8. atoms of different elements have different numbers of __________ in the nucleus. 9. electrons move too fast for scientists to know exactly where they are as they circle the nucleus so the ____________ is used to describe them.

Explanation:

Step1: Calculate neutrons for tin isotopes

For each isotope, use $\text{Neutrons} = \text{Mass Number} - \text{Atomic Number}$. Atomic number of tin = 50:

• $120 - 50 = 70$
• $110 - 50 = 60$
• $130 - 50 = 80$
• $118 - 50 = 68$
• $124 - 50 = 74$
• $109 - 50 = 59$

Step2: Match elements to standard symbols

Use IUPAC element symbol conventions to fill Section 3A and 3B.

Step3: Fill atomic structure sentences

Use core atomic theory definitions to complete each blank in Section 3C.

Answer:

Section C (Top, Tin Isotopes):

120: 70
110: 60
130: 80
118: 68
124: 74
109: 59

Section 3A (Element Symbols):

Hydrogen: H
Oxygen: O
Carbon: C
Sodium: Na

Section 3B (Elements from Symbols):

N: Nitrogen
Hg: Mercury
Mg: Magnesium
Al: Aluminum

Section 3C (Sentence Completion):

1. atom
2. positive; nucleus
3. Neutrons; nucleus
4. nucleus
5. negative
6. atomic number
7. mass number
8. protons
9. electron cloud