Atoms and Electrons

What is the smallest unit of an element that retains the properties of that element?

• cell

• atom

• nucleus

• molecule

How many electrons can the first energy level of an atom hold?

• 4

• 6

• 8

• 2

What is the total number of protons and neutrons in an atom called?

• Mass number

• Atomic number

• Element number

• Nuclear number

In which subatomic particle is the atomic number of an element determined?

• Neutron

• Electron

• Nucleus

• Proton

What is the electron configuration of carbon (C)?

• 2, 4

• 2, 6

• 2, 2, 2

• 1s2 2s3 2p3

What is the atomic number of oxygen (O)?

• 6

• 8

• 12

• 10

Which group of elements in the periodic table is known as the noble gases?

• Group 2A

• Group 7A

• Group 18 or Group 8A

• Group 1A

How many electrons are present in the outermost shell of a chlorine (Cl) atom?

• 7

• 8

• 5

• 10

What is the atomic number of sodium (Na)?

• 11

• 13

• 12

• 10

What is the name of the first element in the periodic table?

• Carbon

• Hydrogen

• Helium

• Oxygen