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Chemistry A Level > The Atom and Redox > Flashcards

Flashcards in The Atom and Redox Deck (15):
1

What is the definition of relative isotopic mass?

THe mass of an atom of a specific isotope of an element relative to 1/12th of the mass of an atom of C12

2

What is the definition of relative atomic mass?

The weighted mean mass of an element relative to 1/12th the mass of an atom of C12

3

How is relative atomic mass calculated?

(Percent of sample/100 x Mass of isotope) for all isotopes, added together

4

What is the definition of relative molar mass?

The weighted mean mass of a molecule, relative to 1/12th the mass of an atom of C12

5

What is the definition of relative formula mass?

The weighted mean mass of a formula, relative to 1/12th the mass of an atom of C12

6

What is the definition of 1st ionisation energy?

The energy required to remove one electron from every atom in one mole of gaseous atoms

7

What is the general formula of a 1st i.e, where X is the element being ionised?

X(g) --> X+(g) + e-

8

What are the four subshells, in order of smallest to largest?

S,P,D,F

9

How many electrons can each sub-shell hold? (S-D)

S=2
P=6
D=10

10

What is redox?

A reaction where an element loses electrons (Oxidation), whilst a different element gains electrons (Reduction)

11

How many electrons can the first shell hold?

2

12

How many electrons can shells after the first hold?

8 - But can hold more sometimes

13

What three factors effect 1st ionisation energy?

1. Proton number / Nucleus attraction
2. Shielding e-
3. Atomic radius

14

What is the general trend in first ionisation energy across a period?

Generally increasing, decreasing from 2-3 as the electrons enter the p subshell and from 5-6 as electrons start having to share orbitals, slightly repelling eachother.

15

What is an orbital?

A region of space occupied by up to 2 electrons with opposite spins.