10. calcium ions play an important role in the function of neurons in the brain. elements that are chemically similar to calcium can interfere with the function of neutrons. which of the following is most likely to imitate calcium’s role in the function of neutrons?
a. sodium
c. strontium
b. potassium
d. rubidium

11. when the noble gases were first discovered, argon was placed with the noble gases in mendeleev’s periodic table, and potassium was placed with the alkali metals. how did this contradict mendeleev’s overall principle behind the organization of his periodic table?
a. argon has a higher atomic mass than potassium
c. argon has similar physical properties with the other noble gases
b. potassium has a higher atomic number than argon
d. potassium has similar chemical properties with the other alkli metals

12. according to the periodic table, which group do chlorine and iodine belong to?
a. alkali metals
c. alkaline earth metals
b. halogens
d. noble gasses

13. within a group of elements, as the atomic number increases, the atomic radius _______.
a. remains approximately constant
c. decreases
b. increases
d. increases and then quickly decreases

14. who updated the periodic table by arranging elements according to atomic number?
a. john dalton
c. dmitri mendeleev
b. j.j. thomson
d. henry moseley

15. arsenic belongs to group 15. how many electrons does arsenic have in its outermost enery level (valence electrons)?
a. 5
c. 33
b. 15
d. 4

16. in which of the following sets, are the charges given correctly for all the ions?
a. na⁺,mg⁺,al⁺
c. rb⁻,ba⁻²,p⁻³
b. k⁺,sr⁺²,o⁻²
d. n⁻,o⁻²,f⁻³

17. according to the periodic table, to which group do lithium and franciun belong?
a. alkali metals
c. transition metals
b. halogens
d. noble gases

18. in which of the following sets is the symbol of the elements, number of protons, and the number of electrons given correctly?
a. in, 49 protons, 49 electrons
c. cs, 55 protons, 132.9 electrons
b. zn, 30 protons, 60 electrons
d. f, 19 protons, 19 electrons

Question

10. calcium ions play an important role in the function of neurons in the brain. elements that are chemically similar to calcium can interfere with the function of neutrons. which of the following is most likely to imitate calcium’s role in the function of neutrons?
a. sodium
c. strontium
b. potassium
d. rubidium

11. when the noble gases were first discovered, argon was placed with the noble gases in mendeleev’s periodic table, and potassium was placed with the alkali metals. how did this contradict mendeleev’s overall principle behind the organization of his periodic table?
a. argon has a higher atomic mass than potassium
c. argon has similar physical properties with the other noble gases
b. potassium has a higher atomic number than argon
d. potassium has similar chemical properties with the other alkli metals

12. according to the periodic table, which group do chlorine and iodine belong to?
a. alkali metals
c. alkaline earth metals
b. halogens
d. noble gasses

13. within a group of elements, as the atomic number increases, the atomic radius _______.
a. remains approximately constant
c. decreases
b. increases
d. increases and then quickly decreases

14. who updated the periodic table by arranging elements according to atomic number?
a. john dalton
c. dmitri mendeleev
b. j.j. thomson
d. henry moseley

15. arsenic belongs to group 15. how many electrons does arsenic have in its outermost enery level (valence electrons)?
a. 5
c. 33
b. 15
d. 4

16. in which of the following sets, are the charges given correctly for all the ions?
a. na⁺,mg⁺,al⁺
c. rb⁻,ba⁻²,p⁻³
b. k⁺,sr⁺²,o⁻²
d. n⁻,o⁻²,f⁻³

17. according to the periodic table, to which group do lithium and franciun belong?
a. alkali metals
c. transition metals
b. halogens
d. noble gases

18. in which of the following sets is the symbol of the elements, number of protons, and the number of electrons given correctly?
a. in, 49 protons, 49 electrons
c. cs, 55 protons, 132.9 electrons
b. zn, 30 protons, 60 electrons
d. f, 19 protons, 19 electrons

Accepted Answer

### Question 10
# Brief Explanations:
Elements in the same group of the periodic table have similar chemical properties. Calcium is in group 2 (alkaline earth metals). Strontium (Sr) is also in group 2, while sodium (Na) and potassium (K) are in group 1 (alkali metals), and rubidium (Rb) is also in group 1. So strontium is most similar to calcium chemically and would most likely imitate its role.
# Answer:
c. Strontium

### Question 11
# Brief Explanations:
Mendeleev's periodic table was organized by atomic mass. Argon (atomic mass ~39.95) has a higher atomic mass than potassium (atomic mass ~39.10), but argon is a noble gas and potassium is an alkali metal. This contradicts the principle of arranging by atomic mass since a heavier element (argon) was placed before a lighter one (potassium) in the table. Option b is about atomic number (not Mendeleev's basis), option c is about physical properties (Mendeleev focused on chemical properties and atomic mass), and option d is consistent with the table's organization (potassium with alkali metals) so it's not a contradiction.
# Answer:
a. Argon has a higher atomic mass than Potassium

### Question 12
# Brief Explanations:
Chlorine (Cl) and iodine (I) are in group 17 of the periodic table, which is the halogens group. Alkali metals are group 1, alkaline earth metals are group 2, and noble gases are group 18.
# Answer:
b. Halogens

### Question 13
# Brief Explanations:
Within a group (vertical column) of the periodic table, as atomic number increases, the number of electron shells increases. Each new shell is further from the nucleus, so the atomic radius increases. For example, in group 1 (Li, Na, K, etc.), atomic radius increases down the group.
# Answer:
b. increases

### Question 14
# Brief Explanations:
Henry Moseley updated the periodic table by arranging elements according to atomic number (number of protons). John Dalton proposed the atomic theory, J.J. Thomson discovered the electron, and Dmitri Mendeleev arranged elements by atomic mass (his original periodic table).
# Answer:
d. Henry Moseley

### Question 15
# Brief Explanations:
Elements in group 15 of the periodic table have 5 valence electrons (outermost energy level electrons). The group number (for main - group elements, groups 1 - 2, 13 - 18) indicates the number of valence electrons. Group 15 means 5 valence electrons. The atomic number of arsenic is 33, but that's the total number of electrons (in a neutral atom), not valence electrons.
# Answer:
a. 5

### Question 16
# Brief Explanations:
- Option a: Magnesium ion should be $\ce{Mg^{2+}}$, aluminum ion should be $\ce{Al^{3+}}$, so incorrect.
- Option b: Potassium ion is $\ce{K^{+}}$, strontium ion is $\ce{Sr^{2+}}$, oxide ion is $\ce{O^{2-}}$, all charges are correct.
- Option c: Rubidium is an alkali metal, so rubidium ion should be $\ce{Rb^{+}}$, not $\ce{Rb^{-}}$, incorrect.
- Option d: Nitrogen ion is usually $\ce{N^{3-}}$, fluorine ion is $\ce{F^{-}}$, not $\ce{F^{-3}}$, incorrect.
# Answer:
b. $\ce{K^{+}},\ce{Sr^{+2}},\ce{O^{-2}}$ (Note: Correct notation for strontium ion is $\ce{Sr^{2+}}$ and oxide ion is $\ce{O^{2-}}$, but among the options, this is the one with correct charges for all ions in the set)

### Question 17
# Brief Explanations:
Lithium (Li) and francium (Fr) are in group 1 of the periodic table, which is the alkali metals group. Halogens are group 17, transition metals are the middle - block elements, and noble gases are group 18.
# Answer:
a. Alkali metals

### Question 18
# Brief Explanations:
- Option a: Indium (In) has an atomic number of 49, so it has 49 protons and (in a neutral atom) 49 electrons, correct.
- Option b: Zinc (Zn) has an atomic number of 30, so it should have 30 electrons (in a neutral atom), not 60, incorrect.
- Option c: Cesium (Cs) has an atomic number of 55, so it has 55 protons and 55 electrons (in a neutral atom). The 132.9 is the atomic mass (not number of electrons), incorrect.
- Option d: Fluorine (F) has an atomic number of 9, so it has 9 protons, not 19, incorrect.
# Answer:
a. In, 49 protons, 49 electrons

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 10

Answer:

Question 11