Chapter 2 Review

Compared with ³¹P, the radioactive isotope ³²P has

• a different atomic number.

• one more electron.

• one more proton.

• one more neutron.

Answer explanation

•Atoms of an element have the same number of protons but may differ in the number of neutrons

How many neutrons does Carbon have?

• 3

• 6

• 12

• 18

Answer explanation

atomics number - # of protons = # of neutrons

How many valence electrons does Boron have?

• 3

• 4

• 5

• 6

Answer explanation

5 electrons total. 2 in the first sell. 3 in the valence shell.

Helium, Neon, and Agron...

• all have 2 valence electrons.

• are Noble Gases.

• all have 2 electron shells.

• are isotopes.

Answer explanation

Nobel gases all have completed valence shells which makes them stable.

What is the total number of protons and neutrons in the element ⁷³Ge?

• 146

• 33

• 73

• 15

Answer explanation

Atomic mass = protons + neutrons

A subatomic particle with no electrical charge?

• Proton

• Neutron

• Electron

Elements that makeup 96% of living matter?

• C, B, H, O

• H,O

• He,C,O,N

• C,H,O,N

The isotope carbon‐14 has

• 6 neutrons

• 8 neutrons

• 14 protons

• 8 electrons

What does the atomic number tell us about an element?

• The number of valence electron

• The number of protons

• The number of neutrons

• None of these are correct

Atomic mass is...

• protons+neutrons+electrons

• protons+neutrons

• electrons+protons

• electrons+neutrons