Chap 4 sci

Question 1

Atom

Answer 1

the smallest unit of an element that maintains the properties of that element

Question 2

Electron

Answer 2

a subatomic particle that has a negative charge

Question 3

Nucleus

Answer 3

In physical science, an atom’s central region, which is made up of protons and netrons

Question 4

Electron Cloud

Answer 4

a region around the nucleus of an atom where electrons are likely to be found

Question 5

Proton

Answer 5

a subatomic particle that has a positive charge and that is found in the nucleus of an atom

Question 6

Atomic mass unit

Answer 6

A unit of mass that describe the mass of an atom or molecules

Question 7

Neutron

Answer 7

A subatomic particle that has no change and that is found in the nucleus of an atom

Question 8

Atomic number

Answer 8

the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of at element

Question 9

Isotope

Answer 9

An atom that has the same number of protons ( or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)

Question 10

Mass number

Answer 10

The sum of the numbers of protons and neutrons in the nucleus of an atom

Question 11

Atomic Mass

Answer 11

Atomic Mass

Question 12

Gravitational

Answer 12

Gravitational pull object together.

Question 13

Electromagnetic Force

Answer 13

It allows objects that attracted to each other come together.

Question 14

Strong Force

Answer 14

Allows nucleus containing more than one protons to stay together.

Question 15

Weak Force

Answer 15

Allows the neutron to change into a proton and an electron.

Question 16

John Dalton

Answer 16

Developed the Atomic theory.

Question 17

J.J. Thomson

Answer 17

He discovered the small particles in the atom.

Question 18

Ernest Rutherford

Answer 18

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Question 19

Niels Bohr

Answer 19

Discovered that electrons move around in certain paths.