Atomic Number Atomic Mass and Isotopes

The atomic number is the same as the number of proton

• True

• False

Which of the following sub-particles of atom is negatively charged?

• proton

• electron

• neutron

An atom with 11 protons and 12 electrons has the atomic number of

• 11

• 12

• 23

Tags

NGSS.MS-PS1-1

Isotopes of the same element have different mass numbers. Hence, their chemical properties are different.

• True

• False

• Somehow

Tags

NGSS.HS-PS1-8

The lightest of all atomic sub-particles is

• proton

• neutron

• electron

• none of the above

If an electrically neutral atom has 7 electrons, how many protons are there in its nucleus?

• 7

• 8

• 15

Tags

NGSS.MS-PS1-1

Radioactive isotopes have unstable nucleus

• True

• False

Tags

NGSS.HS-PS1-8

Check all correct statement(s)

• Isotopes have same number of proton

• Isotopes have different neutron number

• Both mass number and atomic number of isotopes are different

• Isotopes have different nucleon number

Draw an atom having 8 electrons

Answer explanation

indicate the nucleus and electrons revolving round it.

Tags

NGSS.MS-PS1-1

Check all correct options:

⁵⁴₂₆X. Atom X has

• 26 electrons

• 28 neutrons

• 26 protons

• 54 nucleon number

Tags

NGSS.MS-PS1-1