Chemisrty test 2

Question 1

The basic unit of life

Answer 1

Atom

Question 2

Positive charge

Answer 2

Proton

Question 3

No charge

Answer 3

Neutron

Question 4

Negative charge

Answer 4

Electron

Question 5

the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.

Answer 5

Nucleus

Question 6

The experiment where protons were discovered. Positively charged nucleus and surrounded by orbiting electrons

Answer 6

Gold foil experiment

Question 7

The expermiment where an electron was discovered. Atoms made of electrons flow in positive particles

Answer 7

Cathode ray

Question 8

Who invented the cathode ray?

Answer 8

JJ tompson

Question 9

a conductor through which electricity enters or leaves an object, substance, or region.

Answer 9

Electrode

Question 10

The experiment where the charge and mass of all electrons was discovered

Answer 10

Oil drop experiment

Question 11

Who invented the oil drop experiment?

Answer 11

Robert Milikan

Question 12

an attractive and repulsive force between particles are caused due to their electric charges

Answer 12

Electrostatic force

Question 13

a force of attraction (attractive force) that attracts all physical forms having mass

Answer 13

Gravitational force

Question 14

The unit of mass for an atom

Answer 14

Atomic mass unit

Question 15

The mass of an atom

Answer 15

Atomic mass

Question 16

the total number of protons and neutrons in a nucleus.

Answer 16

Mass number

Question 17

the number of protons in the nucleus of an atom

Answer 17

Atomic number

Question 18

an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

Answer 18

Ion

Question 19

Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei

Answer 19

Isotope

Question 20

The experiment where it was discovered that electrons are orbiting at very specific distances from the nucleus.

Answer 20

Bohr model

Question 21

The rule that determines where the electrons go on the energy levels

Answer 21

2,8,8

Question 22

Where the electrons are located

Answer 22

Energy level

Question 23

The release of radioactive substances

Answer 23

Radioactive emission

Question 24

The particle that is made of 2 protons and 2 neutrons. Has a mass number of 4 and a charge of 2+.

Answer 24

Alpha particles

Question 25

The particle that is made of electrons. Has a mass numver of 0 and a charge of -1.

Answer 25

Beta particles

Question 26

The particle that is made of high energy photon with a short wavelength

Answer 26

Gamma radiation

Question 27

The original unstable radioactive isotope

Answer 27

Parent element

Question 28

The remaining nuclide left over from radioactive decay.

Answer 28

Daughter element

Question 29

Radioactive isotopes of an element.

Answer 29

Radioisotope

Question 30

The time taken for the radioactivity of a specified isotope to fall to half its original value.

Answer 30

Half-life

Question 31

A theory of the nature of matter:

Answer 31

Atomic theory

Question 32

A thing that is composed of two or more separate elements; a mixture.

Answer 32

Compund

Question 33

The measure of the average amount of a given isotope naturally occurring on Earth.

Answer 33

Natural abundance

Question 34

The difference between estimated value and the actual value

Answer 34

Percent error

Question 35

A sequence of radioactive decay processes

Answer 35

Chain of decay