Physics - naming compounds and writing chemical formulas

What does the ratio of atoms binding in a compound depend on?

The ratio in which atoms bind in a compound depends on the binding possibilities(valency) of the different compounds

What is valance electrons?

The number of electrons in the outermost shell.

What does valency mean?

The number of electrons an element donates/shares/accepts to form a compound.

How many electrons do the groups have and how many can all the groups give?

+ is give

- take

1 - 1 (1+)

2 - 2 (2+)

13 - 3 (3+)

14 - 4 (4+-)

15 - 5 (3-)

16 - 6 (2-)

17 - 7 (1-)

18 - 8 (0)

What does valance electrons give away?

Valance electrons only give away what is needed and first donate to metals first.

How can chemical reactions be presented?

Chemical reactions can be represented in:

words (writing out chemical means)

chemical formulas (using chemical symbols)

models (drawing/designing models of chemical reactions)

What is rule one of naming compounds?

write the name of the first element and write the of the 2nd element and change the end of the 2nd element to ‘ide’ (add it to the last vowel).

What is rule two of naming compounds?

Name the first element. Name the second element and change the ending to ‘ate’.

What is rule three of naming compounds? (exception of rule 2)

OH - hydroxide

eg. KOH - potassium hydroxide

What is rule four of naming compounds?

Only molecules that have more than one type of atoms we use prefixes to denote the number of atoms in a compound.

mono -1

di - 2

tri - 3

tetra - 4