chemreview

What is the atomic number of this element?

• 8

• 15.999

What is a row of elements on the periodic table called?

• period

• group

What particles determine the mass number?

• Protons and electrons

• Electrons and neutrons

• Protons and neutrons

• Protons, neutrons, and electrons

The atomic number is equal to _.

• the number of protons

• the number of neutrons only

• the total number of protons and neutrons

• the number of protons, neutrons, and electrons

How many neutrons does this bromine atom have?

• 35

• 45

• 80

• 115

What changes when an atom becomes an ion?

• The number of electrons

• The number of protons

• The number of neutrons

• Both the number of neutrons and electrons

What is the charge on a lithium atom that loses 1 electron?

• +1

• 0

• -1

• -2

How many electrons does this magnesium ion have?

• 24

• 12

• 10

• 14

What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc
• Copper
• Nickel
• Germanium

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹