Atomic Structure And The Periodic Table

Question 1

_____ represents one atom of an element

Answer 1

Chemical symbol

Question 2

Atom

Answer 2

The smallest part of an element that can exist

Question 3

Substance made of one type of atom only

Answer 3

Element

Question 4

Where are metals shown on the periodic table ?

Answer 4

On the left hand side

Question 5

Some nonmetals exist as _____

Answer 5

Molecules

Question 6

Name some two ion Molecules

Answer 6

Iodine I2
Hydrogen H2
Oxygen O2
Bromine Br2
Chlorine Cl2
Fluorine Fl2
Nitrogen N2

Question 7

A collection of two or more atoms held together by chemical bonds

Answer 7

Molecules

Question 8

Substance found by the union of two or more elements

Answer 8

Compound

Question 9

The elements in a compound are present in _____

Answer 9

Fixed proportions

Question 10

Formula

Answer 10

Combination of symbols that indicates the chemical composition of a Substance.

Question 11

Consists of one element or compound only

Answer 11

Pure substance

Question 12

Two or more substances that are not chemically joined together

Answer 12

Mixture

Question 13

How can mixtures be separated?

Answer 13

By physical processes

Question 14

____ separates an insoluble solid from a liquid

Answer 14

Filtration

Question 15

Crystallization

Answer 15

Process of producing crystals from a solution by evaporating the solvent

Question 16

Explain filtration

Answer 16

• a solid and liquid mixture is poured into a filter funnel

•the liquid drops through the filter paper into the beaker below ; soldi particles are caught in the filter paper

Question 17

Separation method used to separate a solvent from a solution.

Answer 17

Simple distillation

Question 18

Explain simple distillation

Answer 18

•salty water is heated and water evaporates

•the water vapor cools a in the condenser then drips down into a beaker

•the salt stays behind

Question 19

Fractional Distillation

Answer 19

Separates different liquids from a mixture of liquids

Question 20

Separates different substances dissolved in a liquid

Answer 20

Chromatography

Question 21

What discovery led to the plum pudding model of the atom ?

Answer 21

The discovery of the electron

Question 22

Who published ideas about atoms

Answer 22

John Dalton (in 1803)

Question 23

When was the plum pudding model discovered ?

Answer 23

1903 by JJ Thomson

Question 24

Describe the plum pudding model of the atom

Answer 24

A ball if positive charge with negative electrons embedded in it

Question 25

What experiment led to the nuclear model of the atom

Answer 25

The alpha particle scattering experiment

Question 26

Which scientist came up with the Nuclear model of the atom

Answer 26

Ernest Rutherford (1909)

Question 27

Describe The Nuclear (E.R) model of the atom

Answer 27

The Mass of an atom concentrated at its centre is the nucleus which is positively charged

Question 28

Who adapted Ernest Rutherfords model of the atom ?

Answer 28

Niels Bohr

Question 29

How did Niels Bohr adapt the nuclear model of the atom

Answer 29

By suggesting that electrons orbit the nucleus at certain distances

Question 30

Later experiments led to the idea that the nucleus contains ___

Answer 30

Protons

Question 31

Who’s experiment provided evidence for neutrons in the nucleus

Answer 31

James Chadwick (1932)

Question 32

Subatomic particle with a positive charge and relative mass of +1

Answer 32

Proton

Question 33

Uncharged subatomic particle with a mass of 1 relative to a proton.

Answer 33

Neutrons

Question 34

Subatomic particle with a negative mass and negligible mass relative to protons and neutrons

Answer 34

Electrons

Question 35

What is the radius of an atom ?

Answer 35

0.1nm

Question 36

Where is the most of the mass of an atom located

Answer 36

In the nucleus

Question 37

What does the nucleus contain ?

Answer 37

Protons , neutrons , electrons

Question 38

Atomic number of an atom equals
______

Answer 38

the number of protons in the atom