CHM 090: Chapter 1 Review

Which subatomic particles are in the nucleus?

• Protons and Neutrons

• Electrons and Protons

• Only Electrons

• Neutrons and Electrons

Which element has 6 protons and a mass of about 12?

• Carbon (C)

• Oxygen (O)

• Nitrogen (N)

• Helium (He)

Tags

NGSS.MS-PS1-1

What is the name for the elements in Group 16?

• Chalcogens

• Halogens

• Noble Gases

• Alkali Metals

Isotopes have the ______ number of protons, and a ______ number of neutrons.

• Same, different.

• Different, same.

• Same, same.

• Different, different.

Boron has two naturally occurring isotopes, 10B and 11B, which have masses of 10.0129 and 11.0093 amu, respectively. Given the average atomic mass of boron (10.81 amu), determine the percent abundance of each isotope.

• 10B- 20%, 11B- 80%

• 10B- 50%, 11B- 50%

• 10B- 80%, 11B- 20%

• 10B- 35%, 11B- 65%

Tags

NGSS.MS-PS1-1

Which subatomic particle has virtually no mass?

• The electron

• The proton

• The neutron

• The positron

Which element has the symbol Na?

• Sodium

• Nitrogen

• Neon

• Nickel

Elements that are a part of the staircase are called...(2 Names).

• Semimetals or Metalloids

• Noble Gases

• Alkali Metals

• Halogens

If you have an isotope of Chromium-58, what is the atomic mass?

• 58

• 52

• 60

• 54

Two naturally occurring isotopes of antimony are 121Sb (57.21%) and 123Sb (42.79%). They have masses of 120.904 and 122.904 amu, respectively. What is the average atomic mass of Sb?

• 121.76 amu

• 120.90 amu

• 122.90 amu

• 121.00 amu

Tags

NGSS.MS-PS1-2