Masses of Atoms

What are isotopes?

• Atoms of different elements with different numbers of neutrons

• Atoms of the same element with the same number of neutrons

• Atoms of different elements with the same number of neutrons

• Atoms of the same element with different numbers of neutrons

Answer explanation

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This results in different atomic masses while retaining the same chemical properties.

What unit is used to measure the mass of an atom?

• atomic weight

• atomic mass unit

• atomic grams

• atomic gram unit

Almost all of the atom’s mass is located here.

• electron cloud

• protons

• nucleus

• neutrons

What abbreviation is used to measure the mass of an atom?

Tags

NGSS.HS-PS1-7

These two parts of an atom about the same mass of 1 amu.

• electrons and protons

• protons and nucleus

• neutrons and electrons

• protons and neutrons

This is the sum of the number of protons and neutrons in the nucleus of an atom.

• atomic number

• mass number

The mass number is equal to the number of these in the nucleus.

• electrons and neutrons

• protons and neutrons

• electrons and protons

What is the name for atoms of the same element that have different numbers of neutrons?

• neutrons

• isotopes

• average atomic mass

• atomic mass units

For an element, this is the weighted average mass of all naturally occurring isotopes of an element.

Zinc has 30 protons, an atomic number of 30, and 35 neutrons. What is it's mass?