UNIT 3 Review: Atoms & the Periodic Table 2022-23

Where is most of an atom's mass located?

• in the nucleus
• outside the nucleus
• both in the nucleus and in the energy levels
• atoms don't have mass

Which subatomic particle is NOT found in the nucleus?

• proton
• neutron
• electron
• they're ALL in the nucleus

What charge does an electron hold?

• positive
• negative
• neutral

In a neutral atom, the number of protons is EQUAL TO the number of __________.

• protons
• neutrons
• electrons
• none of the above

Carbon-14 has an atomic number of 6. How many neutrons does it have?

• 6
• 14
• 8
• we cannot determine this information

Lithium-7 has an atomic number of 3. How many protons does it have?

• 3
• 4
• 7
• this cannot be determined

Which of the following is TRUE about isotopes?

• same element, different masses
• same element, same masses
• different element, same masses
• different element, different masses

An isotope of an element contains different numbers of which subatomic particle?

• protons
• neutrons
• electrons
• isotopes don't have different amounts of particles

An isotope of krypton has 36 protons, 47 neutrons and 36 electrons. What is its mass number?

• 36
• 47
• 72
• 83

How many maximum electrons can fill the 2nd energy level of any Bohr model?

• 2
• 4
• 8
• 18