Atoms and Isotopes

How many electrons does the following ion have?

• 3

• 7

• 10

• 14

Tags

NGSS.MS-PS1-1

Atoms of the same element with a different number of neutrons are called _________.

• elements

• isotopes

• ions

• neutral

Which is true of the following beryllium atom?

• 4 protons and 9 neutrons

• 5 neutrons and 4 electrons

• 9 protons and 4 neutrons

• 4 protons and 2 electrons

Tags

NGSS.MS-PS1-1

What does the atomic number identify?

• The number of neutrons.

• The number of protons.

• The number of protons + neutrons.

• The number of electrons.

Tags

NGSS.MS-PS1-1

The number of protons + neutrons in the nucleus is referred to as what?

• Atomic number

• Atomic mass

• Mass number

• Isotope number

Which subatomic particle is used to identify the atom, as it never changes?

• Protons

• Neutrons

• Electrons

An ion with a positive charge has __________.

• the same number of protons and electrons.

• lost a proton.

• lost an electron.

• gained an electron.

How many electrons does the following ion have?

• 10

• 12

• 14

• 22

Tags

NGSS.MS-PS1-1

Which of the following describes a positive ion?

• 10 protons, 12 electrons

• 12 protons, 10 electrons

• 12 protons, 12 electrons

Which of the following describes a negative ion?

• 8 protons, 8 neutrons, 8 electrons

• 8 protons, 8 neutrons, 10 electrons

• 8 protons, 10 neutrons, 8 electrons

• 8 protons, 8 neutrons, 6 electrons