Question 1

Which statement best describes the difference between mass number and atomic mass?

Accepted Answer

Mass number is the total number of protons and neutrons in an atom, while atomic mass is the average mass of all the isotopes of an element.

Question 2

Given the chemical formula $$\mathrm{Ca_3$(PO_4$)_2}$$, how many oxygen atoms are present in one formula unit?

Accepted Answer

Question 3

Which of the following is NOT a property of metals as described in the periodic table?

Accepted Answer

They have properties midway between those of metals and nonmetals.

Question 4

A neutral atom of sodium ($$^{23}_{11}\mathrm{Na}) $$has how many electrons?

Accepted Answer

11

Question 5

Which subatomic particle has a relative charge of $$-1$$?

Accepted Answer

Electron

Question 6

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different mass numbers.

Question 7

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its mass number?

Accepted Answer

35

Question 8

Which element is named after a scientist?

Accepted Answer

Nobelium

Question 9

What is the chemical symbol for potassium?

Accepted Answer

K

Question 10

Which of the following best describes the periodic law?

Accepted Answer

Elements are arranged in order of increasing atomic number.

Question 11

A sample contains 80% $$^{35}\mathrm{Cl} ($$atomic mass = 34.97 amu) and 20% $$^{37}\mathrm{Cl} ($$atomic mass = 36.97 amu). What is the average atomic mass of chlorine in the sample?

Accepted Answer

$$35.37\ \mathrm{amu}$$

Question 12

Which of the following is a metalloid?

Accepted Answer

Silicon

Question 13

How many protons, neutrons, and electrons are in $$^{14}_{6}\mathrm{C}$$?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 14

Which of the following is NOT part of Dalton's Atomic Theory?

Accepted Answer

Atoms are composed of protons, neutrons, and electrons.

Question 15

What is the total number of atoms in one formula unit of $$\mathrm{NH_4$}_3\mathrm{PO_4$}$$?

Accepted Answer

12

Question 16

Which element has the atomic number 6?

Accepted Answer

Carbon

Question 17

If an atom has an atomic number of 20 and a mass number of 40, how many neutrons does it have?

Accepted Answer

20

Question 18

Which of the following chemical symbols is derived from the Latin name of the element?

Accepted Answer

Na for sodium

Question 19

Which of the following best explains why isotopes of the same element have different mass numbers?

Accepted Answer

They have different numbers of neutrons.

Question 20

Which of the following is the smallest identifiable unit of an element?

Accepted Answer

Atom

Atoms and Elements: Foundations for Anatomy & Physiology

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