Atoms And Atomic Theory Vocab

Question 1

Atom

Answer 1

The smallest particle in which an element can be divided and still be the same substance

Question 2

John Dalton

Answer 2

British chemist who developed his atomic theory gathered from observations gathered during his experiments

Question 3

Electron

Answer 3

The negatively charged particles in an atom that are involved in the formation of chemical bonds

Question 4

Particle

Answer 4

A tiny piece or part

Question 5

Nucleus

Answer 5

The tiny extremely dense positively charged region in the center of an atom, made of protons and neutrons

Question 6

Bohr model

Answer 6

The model of the atom that states that electrons move around the center of an atom’s nucleus and fixed orbit; also called the planetary model

Question 7

Proton

Answer 7

The positively charged particles in the nucleus

Question 8

Ernest Rutherford

Answer 8

Scientist who stated that the atom was most empty space and at the center was a small dense positively charged nucleus

Question 9

Atom Model

Answer 9

A representation of an atom ( a picture of what the atomic theories explain )

Question 10

Neils Bohr

Answer 10

Danish scientist who suggested that electrons travel around the nucleus in fixed paths

Question 11

Fixed orbit

Answer 11

To revolve around an object in a fixed path

Question 12

Neutron

Answer 12

The particles of the nucleus that have no charge

Question 13

Quarks

Answer 13

The subatomic particles that make up protons,electrons, and neutrons

Question 14

Subatomic particles

Answer 14

Any particles that are smaller than an atom

Question 15

Electron cloud

Answer 15

The regions inside an atom where electrons are likely to be found

Question 16

Mass number

Answer 16

The sum of protons and neutrons in an atom

Question 17

John Thomson

Answer 17

British chemist who’s experiments with the cathode ray tube led to the discovery of the electrons. His model is known as the plum pudding model

Question 18

Atomic mass unit

Answer 18

The SI unit used to express the masses of particles in an atom

Question 19

Atomic number

Answer 19

The number of protons in the nucleus of an atom

Question 20

Atomic mass

Answer 20

The weighted average masses of all the naturally occurring isotopes of an element

Question 21

Chemical symbol

Answer 21

A shorthand way to write the name of an element

Question 22

Isotope

Answer 22

atoms with the same number of protons but have different numbers of neutrons

Question 23

Periodic table

Answer 23

A table of elements in order by increasing atomic mass

Question 24

Energy level

Answer 24

A region of an atom in which electrons of the same energy are likely to be found