Nuclear 2

What is the definition of Half-Life?

• The time for half the radioactive nuclei in any sample to undergo radio active.

• Radioactive decay.

• The number of protons and neutrons.

What is Mass Number?

• Plural for nucleus

• Radiation deflected towards negative plate.

• The number of protons and neutrons in the nucleus of an atoms.

What is an isotope

• An atom with the same number of neutrons different number of protons

• An atom that has lost or gained an electron

• An atom with the same number of protons, different number of neutrons

• An atom with the same number of electrons and different neutrons

Tags

NGSS.HS-PS1-8

What is half life

• Time taken for a radioactive atom to decay be 1/4

• Time taken for a radioactive atom to decay by 1/3

• Time taken for a radioactive atom to decay by 1/2

• Time taken for a radioactive atom to decay by 1/5

Tags

NGSS.HS-PS1-8

The centre of an atom is called

• the electron

• the proton

• the nucleus

• the neutron

Tags

NGSS.HS-PS1-8

How many neutrons are in 40 19 K?

• 19

• 21

• 40

• 59

Compared to potassium 40 19 which is an isotope

• A

• B

• C

• D

This particle determines what element you have - the elements identity.

• electron
• proton
• neutron
• valence shell

Tags

NGSS.MS-PS1-1

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

• 11
• 5
• 6
• 16

Tags

NGSS.MS-PS1-1

What makes something radioactive?

• elements with an atomic number above 81
• an unstable nucleus
• contaminated sewage
• It decays over time

Tags

NGSS.HS-PS1-8