Chemistry II - Atoms and Ions + Nuclear Decay

An isotope with an unstable nuclei is called

• an isotopic nuclei

• a covalent nuclei

• a radioisotope

• a radionucleus

Tags

NGSS.HS-PS1-8

Select the right answers.

The strong nuclear force is

• repulsive

• attractive

• short range

• long range

• medium range

Electrostatic repulsion is _______ and repel sub-particles that are the ________

• strong

• weak

• same

• different

• electrons

Tags

NGSS.HS-PS3-5

NGSS.HS-PS2-4

The time required for a number of atoms to decrease to half its number through decay is called

• full life

• 0.5 life

• half life

• half decay

Tags

NGSS.HS-PS1-8

What are the two forces within an atom's nucleus?

• weak nuclear force

• strong nuclear force

• electrostatic attraction

• electrostatic repulsion

• electronic repulsion

An atom becomes charged when it loses or gains an electron. This is called

• nuclear decay

• anion

• ionisation

• de-ionisation

Select the right answers.

When an atom loses an electron, it becomes ________ charged and is called a ________

• positively

• negatively

• anion

• cation

• ionisation

Tags

NGSS.HS-PS1-1

Select the right answers.

When an atom gains an electron, it becomes ________ charged and is called a ________

• positively

• negatively

• anion

• cation

• ionisation

Lithium (Li) has one valence electron. It loses this electron and becomes

• a cation

• an anion

• negatively charged

• ionisation

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Covalent bonds are when electrons are taken and lost between atoms.

• True

• False