Test Atoms

Question 1

Dalton’s discovery

Answer 1

Atoms combine in specific ratios; atoms of one element can be converted into atoms of another element during a chemical reaction;

Question 2

Dalton 2

Answer 2

Atoms of one element are identical to each other but different to atoms of another element

Question 3

Thomsons discovery

Answer 3

Cathode rays are negatively charged; atoms must contain a positive charge that balances the negatively charged electrons

Question 4

Rutherford discovery

Answer 4

All atoms have a nucleus

Question 5

Chadwick’s discovery

Answer 5

The nucleus also contains neutrons

Question 6

Bohr’s discovery

Answer 6

Electrons move in circular orbits around the nucleus. Electrons closer to the nucleus have less energy

Question 7

Modern theory

Answer 7

Electrons form an electron cloud

Question 8

Alpha particles

Answer 8

Dense and positively charged; made of 2 protons and 2 neutrons

Question 9

Beta particles

Answer 9

High energy electron

Question 10

Gamma decay

Answer 10

Do not contain particles, but they do contain a lot of energy. Does not change one element into another element

Question 11

How is radioactivity harmful, yet helpful to people

Answer 11

You could get radioactive shock….it can spontaneously elite energy without sunlight

Question 12

Ion

Answer 12

An atom that is no longer neutral because it has lost or gained balance electrons

Question 13

Atom

Answer 13

A small particle that is the building block of all matter; the smallest peace of an element that still represents that element

Question 14

Democritus discovery

Answer 14

Matter is made of small, solid objects that cannot be divided, created or destroyed

Question 15

Electron

Answer 15

A negatively charged particle that occupies the space in an atom outside the nucleus

Question 16

Nucleus

Answer 16

The region in the center of an atom where most of the atoms mass and positive charge are concentrated

Question 17

Proton

Answer 17

Positively charged particle in the nucleus of an atom

Question 18

Neutron

Answer 18

A neutral particle in the nucleus of an atom

Question 19

Electron cloud

Answer 19

The region surrounding an atoms nucleus where one or more electrons are most likely to be found

Question 20

Atomic number

Answer 20

The number of protons in an atom of an element

Question 21

Isotope

Answer 21

Atoms of the same element that have different numbers of neutrons

Question 22

Mass number

Answer 22

The sum of the number of protons and neutrons in an atom

Question 23

Average atomic mass

Answer 23

The average mass of elements isotopes, weighted according to the abundance of each isotope

Question 24

Radioactive

Answer 24

Any element that spontaneously emits radiation

Question 25

Nuclear decay

Answer 25

A process that occurs when an unstable atomic nucleus changes by emitting radiation