C1/2 Periodic table and atomic structure Flashcards

1
Q

Alkali metals

A

Group 1 elements

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2
Q

Atom

A

The smallest part of an element that can exist

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3
Q

Atomic nucleus

A

Positively charged objects composed of protons and neutrons at the centre of every atom with one or more electrons orbiting it

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4
Q

Atomic number

A

The number of protons in the nucleus

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5
Q

Chromatography

A

A separation technique used to separate a mixture of chemicals by distributing the components between two phases

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6
Q

Compound

A

A substance made up of two or more chemically combined elements

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7
Q

Crystallisation

A

A separation technique used to produce solid crystals from a solution by evaporation the solvent

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8
Q

Displacement

A

A chemical reaction in which a more reactive element displaces a less reactive element from its compound

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9
Q

Electron

A

Negatively charged subatomic particles which orbit the nucleus at various energy levels. Very small relative mass.

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10
Q

Electron shell

A

Different energy levels in atoms occupied by electrons

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11
Q

Element

A

A substance made up of only one type of atom

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12
Q

Filtration

A

A separation technique used to separate solids from liquids

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13
Q

Fraction distilation

A

A method of separating a mixture of substances according to their different boiling points

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14
Q

Group

A

The columns of the periodic table represent different groups of elements. Element with similar properties are in the same group.

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15
Q

Halogens

A

The elements in group 7 of the periodic table

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16
Q

Ion

A

An atom or molecule with an electric charge due to the loss or gain of electrons

17
Q

Isotope

A

Atoms of the same element with the same number of protons but a different number of neutrons

18
Q

Mass number

A

The total number of protons and neutrons in the nucleus

19
Q

Metals

A

Elements that react to form positive ions

20
Q

Mixture

A

A mixture consists of two or more elements that are not chemically combined but physically

21
Q

Neutron

A

Neutral subatomic particles present in the nucleus of the atom

22
Q

Noble gases

A

The elements in group 0 of the periodic table

23
Q

Non metals

A

Elements that react to from negative ions.

24
Q

Nuclear model

A

The nucleur atomic models stated that the mass was concentrated at the centre of the atom and that the nucleus was charged

25
Periodic table
Table of elements arranged in order of atomic number
26
Plum pudding model
Atomic model divided after the discovery of the electron. The model suggests the atom is a ball of positive charge with electrons scattered around it
27
Proton
Positively charged subatomic particle
28
Relative atomic mass
An average value that takes takes account the abundance of the isotopes of the element
29
Simple distilation
A procedure by which two liquids with different boiling points can be separated
30
Transition metals
The collection of metalic elements in the middle of the periodic table