Atomic structure and the periodic table

Question 1

Atoms of the same element with different numbers of … are called isotopes

Answer 1

neutrons

Question 2

element

Answer 2

made of only one type of atom

Question 3

2H2+O2→2 H2O

describe what is happening in this equation

Answer 3

hydrogen reacts with oxygen

Question 4

how man electrons go in the first shell of an element?

Answer 4

2

Question 5

What is the formula of methane?

Answer 5

ch4

Question 6

if a question asks you what a formula of a certain element is, how do you present it??

Answer 6

IN SYMBOL EQUATION!!!!!!

Question 7

molecule

Answer 7

2 or more elements bonded together

Question 8

what is covelant bonding

Answer 8

A covalent bond is formed when a pair of electrons is shared between two atoms

Question 9

In an element , which number is the atomic number (ALSO THE NUMBER OF PROTONS)!!

Answer 9

THE SMALLER ONE!!! THE MASS NUMBER IS THE BIGGER ONE!!!!
atomic number is usually at the top or the left. mass number is usually at the bottom or at the top right.

Question 10

Suggest why burning hydrogen would be less harmful to the environment than burning methane.

Answer 10

no harmful gases produced

Question 11

what is the apparatus called used in distillation that the liquid boils in and it has a massive round bottom

Answer 11

flask

Question 12

Describe how this fuel is different from crude oil.

Answer 12

the fuel is made up of four hydrocarbons. the fuel is a pure compound. crude oil is a mixture.

Question 13

When the mass of the boron atom is calculated, the mass of the electrons is ignored. Why is the mass of the electrons ignored?

Answer 13

because the mass of an electron is very small

Question 14

What is the electrical charge on the nucleus of the boron atom?

Answer 14

+5

Question 15

how do you find out the number of neutrons?

Answer 15

Atomic mass - atomic number

Question 16

how do you work out the mass number of. an element

Answer 16

add protons and neutrons together

Question 17

Phosphorus has a mass number of 31 and has 16 neutrons.
What percentage of the mass number of phosphorus is the number of neutrons?

Answer 17

16 divided by 31 = 0.516
0.516 x 100 = 51.6 (rounded = 52)

Question 18

Estimate the boiling point of astatine.

Answer 18

337

Question 19

Room temperature is 20 °C.

Which element in the table above is a liquid at room temperature?

Answer 19

bromine

Question 20

To which group of the periodic table do fluorine, chlorine, bromine, iodine, astatine

Answer 20

group 7

Question 21

Which element in the table above will react with sodium chloride solution?

Answer 21

fluorine, because it is more reactive than chlorine

Question 22

In the periodic table, aluminium is in Group…

Answer 22

3

Question 23

Give two reasons why aluminium should be recycled.

Answer 23

affects on the environment, limited resource

Question 24

Aluminium has a low density, conducts electricity and is resistant to corrosion.
Which one of these properties makes aluminium suitable to use as kitchen foil?

Answer 24

resistant to corrosion

Question 25

List the elements in group 4

Answer 25

Carbon silicone geranium tin lead

Question 26

What element is chlorine directly under

Answer 26

Fluorine

Question 27

Give the name of An alkali metal A halogen A noble gas

Answer 27

Sodium Chlorine Helium

Question 28

Give the name of a noble gas and a coloured gas

Answer 28

Argon Chlorine

Question 29

Suggest one reason why Meagan’s table is different from the new one

Answer 29

All rows are same length All elements had to be in one of the groups

Question 30

Define a group

Answer 30

A group in the periodic table is a vertical column of elements. All elements in the same group have the same number of electrons in their outer shell, which is why they have similar chemical properties. Groups are numbered from 1 to 7, with Group 0 for the noble gases.

Question 31

What is the mobile phase and the stationary phase in cryptography

Answer 31

Stationary: paper Mobile phase : solvent that moves through the paper

Question 32

Equation that links distance moved by solvent distance moved by solute and rf value

Answer 32

Rf = distance moved by substance/ distance moved by solvent

Question 33

How to calculate rf value for cormorant

Answer 33

Measure solvent front from bottom of paper NOT THE LINE and divide it by the distance the pigment has moved up the page FROM TTHE BITTOM OF THE PAGE!

Question 34

Define element

Answer 34

SUBSTANCE which contains one type of atom SUBSTANCE that can not be broken down into anything simpler

Question 35

Give one property of helium that is the same as the other gases in group 0

Answer 35

Unreactive Full outer energy level / shell

Question 36

The mass number of an atom is the number of..

Answer 36

Protons and neutrons NOT ELECTRONS because they are to small to be counted

Question 37

Compounds formed when non metals react with metals consist of particles called…

Answer 37

IONS!!!!🧃🧃

Question 38

Compounds formed from only non metals consist of particles called

Answer 38

Molecules

Question 39

Amounts of substances can be described in different ways. Complete the sentences. One mole of a substance is the relative formula mass in... The relative atomic mass of an element compares the mass of an atom of an element with the mass of an atom of...

Answer 39

grams 12c

Question 40

Why does aluminium react with iron oxide?

Answer 40

aliminium is more reactive than it.

Question 41

Suggest one reason why hydrogen should not have been put in column 1 in mendellevs table

Answer 41

sodium is a non metal

Question 42

group 1 group 7 group 0

Answer 42

the alkali metals the halogens the noble gASES THERE IS ALSO THE METALS AND NON METALS WHICH ARE UNDER GROUPS 3 4 5 AND 6!!! THERE IS ALSO THE TRANSITION METALS WHICH IS THE SMALL VALLEY DIP BIT FROM SC TO ZN AND DOWN!!!!!!!!!!!!!

Question 44

Solvent

Answer 44

The liquid in which a solute dissolves to form a solution

Question 45

Solute

Answer 45

The substance that dissolves in a solvent to form a solution.

Question 46

John dalton

Answer 46

Ordered elements according to atomic mass

Question 47

John newlands

Answer 47

Discovered a repeating pattern every 8th element

Question 48

Dmitri Mendeleev

Answer 48

Switched position of elements that didn’t fit the pattern left gaps for undiscovered elements

Question 49

Henry Mosley

Answer 49

Ordered elements by proton number