Question 1

Which experiment led to the discovery of the neutron, a neutral subatomic particle in the atom?

Accepted Answer

Chadwick's experiment with alpha particles

Question 2

What is the atomic number of the element with the symbol 'Cl'?

Accepted Answer

$$17$$

Question 3

A neutral atom of phosphorus ($$^{31}_{15}P) $$contains how many protons, neutrons, and electrons?

Accepted Answer

$$15$$ protons, $$16$$ neutrons, $$15$$ electrons

Question 4

Which of the following is the correct isotope notation for an ion with $$22$$ protons, $$26$$ neutrons, and $$19$$ electrons?

Accepted Answer

$$^{48}_{22}Ti$$^{3+}$$

Question 5

Calculate the average atomic mass of an element with the following isotopic abundances: $$90.92\% at$$ $$19.99$$ amu, $$0.26\% at$$ $$20.99$$ amu, and $$8.82\% at$$ $$21.99$$ amu.

Accepted Answer

$$20.17$$ amu

Question 6

Which of the following compounds is classified as molecular?

Accepted Answer

H$$_2O$$

Question 7

What is the correct name for the compound FeCl$$_2$$?

Accepted Answer

Iron (II) chloride

Question 8

Which group on the periodic table contains the halogens?

Accepted Answer

Group 17

Question 9

What is the empirical formula for the molecular formula $$C_4H_8O_2$$?

Accepted Answer

$$C_2H_4O$$

Question 10

Which of the following is an acid and what is its chemical formula?

Accepted Answer

Nitric acid, $$HNO_3$$

Question 11

Which of the following best describes the majority of the mass and volume of an atom?

Accepted Answer

Most of the mass is in the nucleus; most of the volume is empty space.

Question 12

Which of the following is the correct chemical formula for barium hydroxide?

Accepted Answer

$$Ba(OH)_2$$

Question 13

A sample of lithium contains $$7.59\%$$ $$^6Li (6.0151 $$amu) and $$92.41\%$$ $$^7Li (7.0160 $$amu). What is the average atomic mass of lithium?

Accepted Answer

$$6.94$$ amu

Question 14

Which of the following is the correct name for $$Cl_2O_7$$?

Accepted Answer

Dichlorine heptoxide

Question 15

Which of the following is the correct formula for calcium sulfide?

Accepted Answer

$$CaS$$

Question 16

Which of the following is a property of metalloids as shown on the periodic table?

Accepted Answer

They form a diagonal border between metals and nonmetals.

Question 17

Which of the following is the correct symbolic notation for an ion with atomic number $$15$$, mass number $$31$$, and a $$3-$$ charge?

Accepted Answer

$$^{31}_{15}P$$^{3-}$$

Question 18

Which of the following best describes the charge of alkali metals in ionic compounds?

Accepted Answer

$$1+$$

Question 19

Which of the following is the correct name for $$K_2SO_4$$?

Accepted Answer

Potassium sulfate

Question 20

Which of the following representations in the image below is a ball-and-stick model of methane?

Accepted Answer

c

General Chemistry Study Guide: Atomic Theory, Periodic Table, Chemical Nomenclature

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