Chemisty

Question 1

any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group 1 of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.

Answer 1

Alkali metals

Question 2

highly metallic and are good conductors of electricity. basic metals of group II of the periodic table comprising beryllium, magnesium, calcium, strontium, barium, and radium.

Answer 2

Alkaline earth metals

Question 3

Positively charged atom that is released in the disintegration of radioactive elements and that consists of two protons and two neutrons

Answer 3

Alpha particle

Question 4

An ion that has a negative charge

Answer 4

Anion

Question 5

A unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 of the mass of a carbon atom with mass number 12

Answer 5

Atomic mass unit

Question 6

The number of protons in the nucleus of an atom;

Answer 6

Atomic number

Question 7

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

Answer 7

Average atomic mass

Question 8

A charged electron emitted during certain types of radioactive decay, such as beta decay

Answer 8

Beta particle

Question 9

An ion that has a positive charge

Answer 9

Cation

Question 10

A reaction in which the material that starts the reaction is also one of the products and can start another reaction

Answer 10

Chain reaction

Question 11

The process in which an inner orbital electron is captured by the nucleus of the atom that contains the electron

Answer 11

Electron capture

Question 12

The high-energy photon emitted by a nucleus during fission and radioactive decay

Answer 12

Gamma Ray

Question 13

The time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope

Answer 13

Half life

Question 14

reactive nonmetallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made.

Answer 14

Halogens

Question 15

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

Answer 15

Ion

Question 16

atoms that have the same number of protons and electrons, but a different number of neutrons.

Answer 16

Isotope

Question 17

the total number of protons and neutrons in a nucleus.

Answer 17

Mass number

Question 18

any of a group of rare gases that include helium, neon, argon, krypton, xenon, and usually radon and that exhibit great stability and extremely low reaction rates.

Answer 18

Noble gases

Question 19

a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.

Answer 19

Nuclear Fission

Question 20

a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.

Answer 20

Nuclear fusion

Question 21

a process in which the nucleus of an atom is changed by being split apart or joined with the nucleus of another atom.

Answer 21

Nuclear Reaction

Question 22

a subatomic particle with the same mass as an electron and a numerically equal but positive charge.

Answer 22

Positron

Question 23

the emission of energy in the form of ionizing radiation.

Answer 23

Radioactive Decay

Question 24

An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable.

Answer 24

Radioactive nuclide

Question 25

Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored.

Answer 25

Transition element

Question 26

the changing of one element into another by radioactive decay, nuclear bombardment, or similar processes.

Answer 26

Transmutation