Question 1

Given the isotope $$^{59}_{27}\mathrm{Co}$$, how many protons, neutrons, and electrons does a neutral atom of this isotope contain?

Accepted Answer

27 protons, 32 neutrons, 27 electrons

Question 2

Which of the following elements is a noble gas in Period 2 of the periodic table?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 3

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

Accepted Answer

Silicon ($$\mathrm{Si})$$

Question 4

Which of the following statements was NOT a conclusion from Rutherford's gold foil experiment?

Accepted Answer

Electrons are embedded in a positive 'pudding' throughout the atom.

Question 5

Which element has the largest atomic radius?

Accepted Answer

Potassium ($$\mathrm{K})$$

Question 6

Which element has the highest ionization energy?

Accepted Answer

Bromine ($$\mathrm{Br})$$

Question 7

Which element is the most metallic?

Accepted Answer

Cesium ($$\mathrm{Cs})$$

Question 8

A neutral atom of $$^{81}_{35}\mathrm{Br}$$ has how many neutrons?

Accepted Answer

$$81 - 35 = 46$$ neutrons

Question 9

Which of the following is a halogen in Period 4?

Accepted Answer

Bromine ($$\mathrm{Br})$$

Question 10

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 11

Which isotope is represented by an atom with 18 protons, 22 neutrons, and 18 electrons?

Accepted Answer

$$^{40}_{18}\mathrm{Ar}$$

Question 12

Which of the following best describes a metalloid?

Accepted Answer

An element that has properties intermediate between metals and nonmetals.

Question 13

Which of the following elements is a nonmetal in Group 16, Period 3?

Accepted Answer

Sulfur ($$\mathrm{S})$$

Question 14

Which of the following best explains why ionization energy generally increases across a period?

Accepted Answer

Increasing nuclear charge pulls electrons closer, making them harder to remove.

Question 15

A hospital uses $$^{59}_{27}\mathrm{Co}$$ for cancer treatment. What is the name of this isotope?

Accepted Answer

Cobalt-59

Question 16

Which of the following elements is most likely to form a $$+1$$ ion?

Accepted Answer

Potassium ($$\mathrm{K})$$

Question 17

Which of the following is NOT a property of metals?

Accepted Answer

They are brittle and shatter easily.

Question 18

Which element is a Group 2 metal in Period 4?

Accepted Answer

Calcium ($$\mathrm{Ca})$$

Question 19

Which of the following best describes the trend in metallic character across a period from left to right?

Accepted Answer

Metallic character decreases.

Question 20

Which of the following elements is a transition metal?

Accepted Answer

Iron ($$\mathrm{Fe})$$

Atomic Structure, Periodic Table, and Element Properties: GOB Chemistry Study Notes

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