Unit 2: Chemistry Test Review

What is the basic unit of matter that retains the properties of an element?

• atom

• molecule

• ion

• nucleus

What is the part of the atom where electrons are likely to be found?

• energy levels/orbitals

• proton field

• neutron zone

• atomic core

Which of the following are the fundamental particles of an atom?

• protons, electrons, and neutrinos

• protons, neutrons, and electrons

• neutrons, electrons, and positrons

• protons, neutrons, and photons

Protons and neutrons are found where?

• Photons

• Electron Cloud

• Nucleus

• Orbitals

Isotopes are atoms of the same element with the same number of protons but different numbers of

• electrons

• neutrons

• protons

• ions

Carbon-12 is the most common isotope of carbon. It has 6 protons, 6 neutrons, and 6 electrons. How many valence electrons does a carbon atom have?

• 2

• 4

• 6

• 8

If an atom contains 5 protons, 6 neutrons, and 5 electrons, its mass number is

• 5

• 6

• 11

• 16

If an atom contains 15 protons and 16 neutrons, its atomic number is

• 15

• 16

• 31

• 1

An atom achieves stability by having its outermost energy level

• completely filled

• partially filled

• empty

• positively charged

What can an atom do to achieve a stable electron configuration?

• gain electrons

• lose electrons

• share electrons

• all of the above