Science

Question 1

Atomic Number

Answer 1

A number of protons in the nucleas

Question 2

Electron

Answer 2

Negatively charged neutron

Question 3

Electron cloud

Answer 3

the region surrounding the nucleus

Question 4

element

Answer 4

a substance that cannot be broken down

Question 5

Half-life

Answer 5

The time needed for one-half of the mass of the sample

Question 6

Mass number- The sum of neutrons and protons

Answer 6

electrically neutral particle

Question 7

Proton

Answer 7

positively charged neutron

Question 8

radioactive decay

Answer 8

Release of nuclear particles

Question 9

Transmutation

Answer 9

the changing of an element

Question 10

Beta-particle

Answer 10

High energy electron

Question 11

Alpha particle

Answer 11

Two Neutrons and Two protons

Question 12

Average atomic mass

Answer 12

the average mass of an atom

Question 13

Atom

Answer 13

the basic unit of matter

Question 14

what is the particle in the nucleus with no charge?

Answer 14

neutron

Question 15

The atomic mass of an atom is…..and…..

Answer 15

Protons and neutrons

Question 16

Where are the electrons in an atom?

Answer 16

outside of the atom.

Question 17

What did J.J Thomson discover?

Answer 17

Opposites attract

Question 18

The mass of an isotope is the number of

Answer 18

Protons and neutrons

Question 19

isotopes are atoms of the same element with the same number of

Answer 19

Protons and Electrons

Question 20

define the number of neutrons and subtract …..from……

Answer 20

protons from atomic mass

Question 21

The most stable of isotope of an atom with 12 protons have….neutrons

Answer 21

12

Question 22

A strong nuclear force holds…..together

Answer 22

Atoms

Question 23

radioactive decay is the release of…

Answer 23

Atomic nucleus

Question 24

A……particle consists of two protons and two neutrons

Answer 24

Alpha particles

Question 25

The changing of one element to another in radioactive decay is called…..

Answer 25

transmutation