Question 1

Given the following isotope: $$^{59}_{27}\mathrm{Co}$$, how many neutrons does it contain?

Accepted Answer

32

Question 2

Which of the following statements is NOT a conclusion Rutherford arrived at in his nuclear model of the atom?

Accepted Answer

Electrons are embedded within a positively charged sphere.

Question 3

Which element in Group 14, Period 3 is classified as a metalloid?

Accepted Answer

Silicon (Si)

Question 4

Which element in Group 2, Period 6 is classified as a metal?

Accepted Answer

Barium (Ba)

Question 5

Which element in Period 2 is a noble gas?

Accepted Answer

Neon (Ne)

Question 6

Which element in Period 4 is a halogen?

Accepted Answer

Bromine (Br)

Question 7

Which element has the larger atomic radius: Na or K?

Accepted Answer

K

Question 8

Which element has the highest ionization energy: Sr or Br?

Accepted Answer

Br

Question 9

Which element is the most metallic: Cs, Xe, or Cr?

Accepted Answer

Cs

Question 10

A neutral atom of $$^{18}_{8}\mathrm{O}$$ has how many electrons?

Accepted Answer

8

Question 11

Which of the following best explains why atomic radius increases down a group in the periodic table?

Accepted Answer

Additional electron shells are added, increasing the distance from the nucleus.

Question 12

Which isotope of hydrogen contains one proton and one neutron?

Accepted Answer

$$^{2}_{1}\mathrm{H}$$

Question 13

Which of the following elements is a non-metal in Group 14?

Accepted Answer

Carbon (C)

Question 14

Which element is most likely to form a $$+2$$ ion?

Accepted Answer

Magnesium (Mg)

Question 15

Which of the following elements is a metalloid?

Accepted Answer

Arsenic (As)

Question 16

Which element has the smallest atomic radius: S, O, or Se?

Accepted Answer

O

Question 17

Which element is most likely to be found as a diatomic molecule in nature?

Accepted Answer

Bromine (Br)

Question 18

Which element is a halogen in Period 2?

Accepted Answer

Fluorine (F)

Question 19

Which element is most likely to have the highest electronegativity?

Accepted Answer

Fluorine (F)

Question 20

Which element is most likely to be a good conductor of electricity?

Accepted Answer

Cobalt (Co)

Atomic Structure, Periodic Table Trends, and Element Classification

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