Chemistry

Question 1

Atom

Answer 1

It is the smallest element. It has a nucleus surrounded by electrons

Question 2

Nucleaus

Answer 2

It is the centre of an atom. It is made up of protons and neutrons. It has the most of an atom’s mass.

Question 3

Proton

Answer 3

A positively charged particle. It is in an atomic nucleus.

Question 4

Neutron

Answer 4

A neutron is an uncharged particle and is in an atomic nucleus.

Question 5

Electrons

Answer 5

Electrons are negatively charged particles and is located in the shells that surround an atom’s nucleus.

Question 6

Atomic number

Answer 6

Number of protons in e nucleus of an atom. The atomic number determines which element an atom is.

Question 7

Ionisation

Answer 7

When you take away an electron to form a positive ion.

Question 8

Periods

Answer 8

a set of elements occupying a horizontal row in the periodic table.

Question 9

Groups

Answer 9

a set of elements occupying a column in the periodic table and having broadly similar properties arising from their similar electronic structure.

Question 10

Periodic law

Answer 10

a law stating that the elements, when listed in order of their atomic numbers, fall into recurring groups, so that elements with similar properties occur at regular intervals.

Question 11

Symbol

Answer 11

Representation or abbreviation of an element

Question 12

Atomic number

Answer 12

Number of protons

Question 13

Relative atomic mass

Answer 13

the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12

Question 14

Mass number

Answer 14

Number of protons and neutrons

Question 15

Alkali metals

Answer 15

are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K),rubidium (Rb), caesium (Cs) and francium (Fr).

Question 16

Alkaline earth metals

Answer 16

any of the elements beryllium, magnesium, calcium, strontium, barium, and radium,

Question 17

Noble gases

Answer 17

any of the gaseous elements helium, neon, argon, krypton, xenon, and radon

Question 18

Metals

Answer 18

Elements that form cations when compounds of it are in solution and oxides of the elements form hydroxides rather than acids in water.

Question 19

Metals

Answer 19

achemicalelement (as boron, carbon, or nitrogen) that lacks the characteristics of ametaland that is able to form anions, acidic oxides, acids, and stable compounds with hydrogen.

Question 20

Metalloids

Answer 20

Ametalloidis anychemicalelement which has properties in between those of metals and nonmetals, or that has a mixture of them.

Question 21

Conductor

Answer 21

A conductor is a material which contains movable electric charges.

Question 22

Malleable

Answer 22

Malleabilityis the ability of a substance, usually a metal, to be deformed or molded into a different shape.

Question 23

Ductile

Answer 23

is a physical property of a material associated with the ability to be hammered thin or stretched into wire without breaking.

Question 24

Brittle

Answer 24

1. having hardness and rigidity but little tensile strength; breaking readily with a comparatively smooth fracture, as glass. 2. easily damaged or destroyed