Isotopes and Atoms

Atoms are neutral because

• they have the same number of protons and electrons.

• they have the more protons than electrons.

• they have the more electrons than neutrons.

• they have the more electrons than protons.

What does the mass number tell you?

• The mass of the atom.

• The number of protons in the nucleus.

• The number of neutrons in the nucleus.

• The number of neutrons and protons in the nucleus.

What does the atomic number tell you?

• The mass of the atom.

• The number of protons in the nucleus.

• The number of neutrons in the nucleus.

• The number of neutrons and protons in the nucleus.

All atoms of chlorine have how many protons in their nuclei?

• 16

• 17

• 35

• 35.45

All atoms of uranium have how many protons in their nuclei?

The most common isotope of the element uranium is uranium-238. How many protons are there in each atom of this isotope?

• 146

• 238

• 92

• 145

The most common isotope of the element uranium is uranium-238. How many electrons are there in each neutral atom of this isotope?

• 146

• 238

• 92

• 145

Uranium is named after the Greek god of the sky. A planet is also named after the same god. Who is the Greek god?

Atoms of this element have how many protons in their nuclei?

Tags

NGSS.HS-PS1-1

Atoms of this isotope have how many protons in their nuclei?