Atomic Structure And The Perodic Table

Question 1

Periodic table

Answer 1

All elements in a group have similar chemical properties

This is because all the elements in a group have the same number of electrons in their outer shell

Question 2

In an element are all the atoms the Same

Answer 2

Yes

Question 3

Compound

Answer 3

Compounds contain two or more different elements chemically combined in a fixed proportion

Question 4

Do compounds usually have the same properties to the elements that they are made from

Answer 4

No they usually have totally different properties

Question 5

How do you separate a compound to get back the original elements

Answer 5

With a chemical reaction

Question 6

Mixture

Answer 6

In a mixture, we have different elements or compounds not chemically combined together

Question 7

How can you separate a mixture

Answer 7

Physical techniques e.g. Filtration, crystallisation

Question 8

Molecules

Answer 8

Has any elements chemically joined

Question 9

What does the little number mean next to an element symbol e.g. O(4)

Answer 9

That there are multiples of that element e.g. O(4) = 4 oxygens

Question 10

Specific compound

Answer 10

The number of atoms of each element is fixed

Question 11

Name 4 physical separation techniques

Answer 11

Filtration

Crystallisation

Distillation

Chromatography

Question 12

What is a Physical separation technique

Answer 12

Used to separate mixtures

Can’t be used to separate elements in a compound

Question 13

Filtration

Answer 13

Used to separate an insoluble solid from a liquid

Question 14

Crystallisation

Answer 14

Used to separate a soluble solid from a liquid

Question 15

Simple distillation

Answer 15

Used to separate a liquid from a solid if we want to keep the liquid

Question 16

Fractional distillation

Answer 16

Allows us to separate two different liquids

The 2 liquids must have different boiling points

Question 17

How does simple distillation work

Answer 17

1) evaporate the liquid by heating

2) condense the vapour by cooling

Question 18

Atomic number

Answer 18

Bottom number

=proton number

Question 19

Mass number

Answer 19

Top number

Neutron number = mass number - atomic number

Question 20

Isotope

Answer 20

Atoms of an element with different numbers of neutrons

Question 21

Relative atomic mass

Answer 21

The average of the mass number of the isotopes

Question 22

Equation for relative formula mass Ar

Answer 22

(Mass isotope 1 x % isotope 1) + (mass isotope 2 x % isotope 2)
___________________________________________________________________

                                               100

Question 23

What Mendeleev do to the elements of the periodic table

Answer 23

Arranged elements in order of atomic mass

Question 24

Wha did Mendeleev predict

Answer 24

He predicted the properties of the undiscovered elements based on other elements in the same group

When the elements were discovered the properties were found to almost exactly what he had predicted

Question 25

Transition metals

Answer 25

Less reactive

Question 26

Highly reactive metals

Answer 26

Group 1&2

Question 27

Ions

Answer 27

Charged atom

Question 28

Metals form positive or negative ions

Answer 28

Always positive

Question 29

Group 0 noble gases

Answer 29

Very unreactive

Full outer shell

Question 30

Boiling point group 0

Answer 30

Increase going down the group

Question 31

Group 1 alkali metals

Answer 31

Very reactive

1 electron on outer shell

Reacts with oxygen, water and chlorine rapidly

Question 32

Reactivity group 1

Answer 32

More reactive going down the group

Question 33

Group 7 the halogens

Answer 33

Form molecules with 2 atoms joined by a covalent bond

Non metals

Question 34

Boiling point group 7

Answer 34

Increase as we move down the group

Question 35

What is the negative electron attracted to

Answer 35

The positive charge of the nucleus

Question 36

Reactivity group 7

Answer 36

Less reactive going down the group