Radioactivity

Which of the following defines the Mass number of an atom?

• number of protons + number of electrons

• number of neutrons + number of electrons

• number of protons + number of neutrons

• number of electrons

Which of the following mostly accounts for the mass of an atom ?

• neutrons

• neutron and proton

• electron and neutron

• electron and proton

Tags

NGSS.HS-PS1-7

The isotopes of neutral atoms of an element differ in

• Atomic number

• Mass number

• Number of electrons

• Chemical properties

Which one among the following most correctly determines the atomic number of an element?

• Number of protons

• Number of protons and

• electrons Number of ions

• Number of nucleons

Atoms which have same mass number but different atomic number are called

• isotopes

• isomers

• isotones

• isobars

protons and neutrons which are the main constituents of the nucleus are called

• Nucleons

• Electrons

• Nucleus

• Protons

Tags

NGSS.HS-PS1-8

________has the largest number of isotopes.

• Carbon

• Tin

• Chlorine

• Protium

The atoms of the same elements having the same sonic number but different mass number are called

• Isotopes

• Isotones

• Isobars

• Mirror isobars

Tags

NGSS.HS-PS1-8

Radioactivity is a nuclear phenomenon

• True

• False

Tags

NGSS.HS-PS1-8

If the number of protons and neutrons get interchanged inside the nucleus they are called

• Isotopes

• Neutrons

• Mirror isobars

• Protons

Tags

NGSS.HS-PS1-8