1.3 Electron Configuration and Ions

Which of the following is the definition of the mass number of an atom?

• It is the number of protons + number of neutrons.

• It is the number of neutrons

• It is number protons

• It is the number of protons = number of electrons

Define atomic number of an atom.

• Atomic number if the number of protons and electrons of an atom.

• It is the number of neutrons and protons of an atom.

• Atomic number is the number of electrons in outer shell of an atom.

How many protons a calcium atom has?

• 20

• 40

• 40.078

• 20.078

Tags

NGSS.MS-PS1-1

How many neutrons a sodium atom has?

• 11

• 23

• 12

Tags

NGSS.MS-PS1-1

What is the electron configuration of an atom with 12 protons?

• 2.8.2

• 2.8.5

• 2.5.5

Which of the following is a correct definition of an ion?

• A charged atom

• An atom with its number of protons and electron are NOT equal

• All answers are correct

• An atom that gained or lost one or more electrons.

An atom with negative charge is called ____________.

• cation

• anion

• both answers are correct

• electrons

A neutral atom with 2.8.5 electron configuration. what is the charge of its ion?

• -5

• +3

• -3

When an atom lose an electron, it will become a ____________.

• cation

• anion

• proton

• electron

An atom with 2.8.3 electron configuration. Its ion is a ____________.

(Hint: you need to find the charge)

• metal cation

• metal anion

• non-metal cation

• non-metal anion

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2