Chemistry

Question 1

Atom

Answer 1

The smallest unit of an element. Consists of a central nucleus surrounded by one or more electrons.

Question 2

Nucleus

Answer 2

It is the central part of an atom. Composed of protons and neutrons. Contains most of the atoms mass.

Question 3

Proton

Answer 3

Positively charged particle. Found within an atomic nucleus.

Question 4

Neutron

Answer 4

An uncharged particle (it is neutral). Found within an atomic nucleus

Question 5

Electron

Answer 5

Negatively charged particle. Located in shells that surround an atoms nucleus.

Question 6

Periodic Table

Answer 6

A table of the chemical elements arranged in order of atomic number, usually in rows.

Question 7

Periods

Answer 7

Rows of elements

Question 8

Groups

Answer 8

Columns of elements

Question 9

Periodic law

Answer 9

Stating that elements, when listed in order of their atomic numbers, fall into recurring groups, so that elements with similar properties occur at regular intervals

Question 10

Symbols

Answer 10

A form of shorthand for writing names of the elements

Question 11

Atomic number

Answer 11

The number of protons in the nucleus of an atom

Question 12

Relative atomic mass

Answer 12

The ratio of the average mass of an element

Question 13

Mass number

Answer 13

Total number of protons and neutrons in a nucleus

Question 14

Weighted mean

Answer 14

Relative amounts of each type of atom

Question 15

Alkali metals

Answer 15

React strongly to water To form basic solutions

Question 16

Alkaline earth metal

Answer 16

Reactive metals at standard temperature and pressure

Question 17

Halogens

Answer 17

Reactive non metals which form strongly acidic compounds with hydrogen from which salt can be made

Question 18

Noble gases

Answer 18

Are inert and do not readily react with other substances

Question 19

Transition metal block

Answer 19

The block of elements in the middle of the table