PeriodicmtBle

Question 1

Why are the noble gases called nobel gases

Answer 1

There unreactive and have a stable arrangement of electrons

Question 2

What is the boiling points like for the nobel gases as you go down the group

Answer 2

Boiling points of the nobel gases increase as you go down
Because they increase in size as they gain more shells meaning they have a stronger structure to break

Question 3

Whats the reactivity of the alkalin metals as you go down the group

Answer 3

Increase as you go down
Because atoms get larger and valence shells get further from the nucleus causing a weakened attraction

Question 4

How is the reactivity like in the nobel gases

Answer 4

Decrease

Question 5

What is density

Answer 5

How concentrated something is

Question 6

How could you tell sometning is low density in a liquid

Answer 6

If it floats

Question 7

How do reactive elements react with water

Answer 7

Explosively

Question 8

DescribE a metallic bond

Answer 8

Electrostatic attraction between delocalised outer shell electrons. Occurs in metals,

electricity conductivity is good in solids and liquids

Question 9

Describe ionic bomds

Answer 9

Electrostatic attreaction between oppositely charged ions. Occurs in metals and nonmetals

Poor in solids,
Good in liquids, acids

Question 10

Descrobe covalent bonds

Answer 10

Electrostatic attraction between a shared pair of electrons and the nuckei of 2 atoms. Occurs in non metals

Electrical comductivity is poor with everything

Question 11

What things are found in a metallic structure

Answer 11

Delocalised outer shell electrons
Lattice positive ions

Question 12

Defention of metalic bond

Answer 12

The electrostatic forces of attraction between delocalised outer shell electrons and lattice positive ions

Question 13

What was john daltons atom beliefs

Answer 13

Atoms were tiny sohere of the same matter that couldnt be divided

Question 14

What is the plum pudding model

Answer 14

A spherical cloud of positive charges

Question 15

Who made the plummpudding model

Answer 15

JJ Thompson in 1897, after discoverint the electron

Question 16

What was the alpha scatter experiment

Answer 16

Feoger Marsden Rutherford in 1908-1913, fired alpha particles at very thin gold foil observing some alpha particles were deflected from the middle showing there was a great center of mass

Question 17

Whats the nuclear model

Answer 17

A model of an atom with a tiny positive nucleus surrounded by emoty space

Question 18

What was the Bohr model

Answer 18

A nuclear model proposing electrons orbit the nucleus in fixed shells or orbitals located at a set distance from the nucleus

Question 19

Who discovered that electrons were organised in shells

Answer 19

Bohr 1913 in his nuclear model

Question 20

What was the order of discovery of atomic structure

Answer 20

Electrons
Protons
Neutrons

Question 21

Relative charge of protons neutrons and electrons

Answer 21

+1
0
-1

Question 22

Relative mass of P N E

Answer 22

1
1
1/2000

Question 23

Why is it called the periodic table

Answer 23

Because it is arranged in periods

Question 24

Why is group 1 reactive

Answer 24

The reactivity of Group 1 elements increases as you go down the group because: the atoms get larger. the outer electron gets further from the nucleus. the attraction between the nucleus and outer electron gets weaker – so the electron is more easily lost and react more

Question 25

What did Johann Dobereiner notice

Answer 25

Elememts with similar chemical properties often occured in threes, called triads

Question 26

Who discovered every eigth element reacted in a similar war

Answer 26

John Newlands

Question 27

Who discovered elements with similar properties often occured in threes

Answer 27

Johann Dobereiner

Question 28

What was the problem with Newlands octives

Answer 28

Sometimes elements were grouped together with totally dofferent properties

Question 29

When dod the modern periodic table get created and by who

Answer 29

1896 Dimitri Mendeleev

Question 30

Why did Mendeleev leave gaps in his table

Answer 30

For elements that hadmt been discovered yet

Question 31

2 ways mendeleevs table is different from today

Answer 31

Ordered by atomic weight as protons hadnt been discovered, group zero hadnt been discovered then

Question 32

Whats wrong with ordering the periodic table in atomic weight

Answer 32

Elements can appear in the wrong order due to the presence of iscotopes

Question 33

What did the alpha scatter experiment show

Answer 33

As most alpha particles went straight through, atoms were made up mostly of empty space however the center of the atom must have a positive charge and contain a great deal of mass

Question 34

Who discovered neutrons

Answer 34

1932 chadwick

Question 35

What is the outer layer of a shell called

Answer 35

Valence shell

Question 36

Why is alkaline mteals called that

Answer 36

Because when reacted with water create alkalines

Question 37

Why is alkaline mteals called that

Answer 37

Because when reacted with water create alkalines

Question 38

Why is alkaline mteals called that

Answer 38

Because when reacted with water create alkalines