Atomic Structure And Periodic Tabel ands general

Question 1

What is the top number of the Element

Answer 1

Mass number

Protons+neutrons

Question 2

Bottom number of the element

Answer 2

Atomic number

Number of protons and electrons

Question 3

What’s an isotope

Answer 3

Same element with different number of neutrons therefore the mass number is different

Question 4

What’s the relative atomic mass

Answer 4

Average mass taking in to account the different masses and amounts of all isotopes that make the element

Question 5

What’s a compound

Answer 5

2 elements that have been chemically combined

A compound from a metal and non metal is an ion

Question 6

Balancing equations

Answer 6

There must always be the same number of atoms each side

Question 7

Mixtures

Answer 7

Group of elements not chemically combined
Easily separated
No bonds between parts of mixture
Example: Air

Question 8

Name for group 1 elements

Answer 8

Alkali metals

Question 9

Name for group 7 elements

Answer 9

Halogens

Question 10

Name for group 0 metals

Answer 10

Noble gases

Question 11

What are diatomic molecules

Answer 11

molecules composed of only two atoms, of the same or different chemical elements.

Question 12

Why did dmitri Mendeleev leave gaps in the periodic table

Answer 12

So elements with similar properties where left in the same groups which indicated the existence of other elements

He could see properties like melting point and reactivity go down in the group

Question 13

What was the old periodic table sorted by

Answer 13

Relative atomic mass

Question 14

What is the new periodic sorted by

Answer 14

Atomic number

Question 15

Why do alkali metals get more reactive as they go down

Answer 15

Because thee outer electron becomes further away meaning the force of attraction between the electron and nucleus is weaker meaning it can be losses easier

Question 16

Why do halogens become less reactive as they go down

Answer 16

Because as they go down the outer electrons are further away meaning a weaker force of attracting resulting in it being harder to gain an electron

Question 17

What happens in a displacement reaction

Answer 17

A more reactive metal displaces the less reactive metal from its compound

Question 18

What is a covalent bond

Answer 18

Where 2 or more atoms share electrons

Question 19

What’s an anomalous result

Answer 19

A result that doesn’t fit with the rest of all the results like not following the trend or pattern

Question 20

What is a controlled variable

Answer 20

Something you keep the same during the experiment

Question 21

What is the dependent variable

Answer 21

The thing you are measuring in the experiment