atoms/configuration/periodic

Question 1

Explain why isotopes have the same atomic number

Answer 1

-Because they only have different neutrons
-number of protons and electrons are the same

Question 2

What is an isotope

Answer 2

Atoms of the same element which have same atomic number
But different number of neutrons

Question 3

What is the relative atomic mass

Answer 3

Weighted average mass of an elements isotopes, in comparison to a carbon atom

Question 4

What is the formula for calculating Ar

Answer 4

(isotope mass x %)+(isotope mass x %)

Question 5

What is atomic number

Answer 5

Number of protons in the nucleus of an atom

Question 6

In chemical reactions what changes in terms of the structure of an atom

Answer 6

Number of electrons
(atomic number stays the same)

Question 7

What is electronic configuration

Answer 7

arrangement of electrons in an atom

Question 8

Describe whether metals or non metals are acidic oxides or basic oxides

Answer 8

Metals are basic oxides
Non metals are acidic oxides

Question 9

If an element has 1-3 electrons in its outer shell, it a metal or non metal

Answer 9

Metal

Question 10

Explain why elements in a group have similar properties(2)

Answer 10

Because they have the same number of electrons down their outershells
So will react and bond similarly

Question 11

Why are noble gases unreactive

Answer 11

Because they have full outer shells

Question 12

Covalent bonding and metallic binding difference

Answer 12

Metallic is for metals
Covalent is non metals
Metallic binding is when atoms lose electrons
Covalent bonding is when atoms share electrons

Question 13

If question asks for total number of protons or atomic number and they’ve given you a diagram, how would you calculate

Answer 13

It would be the total number of electrons

Question 14

Explain why hydrogen has a low boiling point

Answer 14

It has weak forces of attraction between the bonds
So little heat is required to break these bonds

Question 15

What are the total number of atoms in Be(OH) 2

Answer 15

5

Question 16

Explain which period an element with configuration 2.8.3 is in and how you got to this conclusion

Answer 16

Period 3
Because ELECTRONS occupy three shells

(Don’t talk about notation)

Question 17

Relative atomic mass of neon is 20.2. How does this information support the fact that it contains more N20 than N22

Answer 17

Because 20.2 is closer to 20 than 22
(Therfore the N20 isotope is heavier than 22. Remeber to think about it as weighted averages.so the average will always lean to the side that carry’s the most weight)

Question 18

How many total electrons are in a Mg 2+ ion

Answer 18

10

(First look at periodic table and see atom in number which is 12, therefore it has a total of 12 electrons
Rmeber the smallest shell can only have a maximum of 2 electrons
The next few shells can only have 8 electrons
because it is 2+ charge, this means it is in group 2. The group number dictates h9w many electrons in the outer shell)

Question 19

Explain why a lithium atom has no charge but when it is in the process of becoming ironically bonded to fluorine it does have a charge
(Use periodic table to help)

Answer 19

An atom of lithium has three protons and three electrons so therefore there is no overall charge as the charges cancel each other out

But then inorder to maintain a full outershell, the lithium atom loses 1 electron from its outershell.
So has a 1+ charge
(Bc Now the number of protons is 1 more than the number of electrons)