ch4 draw dot n cross

Question 1

define covalent bonding

Answer 1

sharing of electrons, between, non-metal atoms

Question 2

for dot and cross drawing place which element at the center

Answer 2

whatever has most electrons to share/whatever is lone element in formula

i.e. h2o

Oxygen in middle as it has most electrons to share + lone element (only 1 o)

Question 3

desc strong covalent bonds

Answer 3

strong forces of attraction btwn nuclei of atoms, shared electrons

Question 4

what is an ion

Answer 4

1.electrically charged atom/group atoms

2. formed loss/gain of electrons

Question 5

what are positive and negative ions held tgt by?

Answer 5

strong electrostatic forces of attraction

Question 6

what determines number of covalent bonds between atoms?

Answer 6

number of pairs of shared electrons

i.e. 1 pair of shared electrons = 1 covalent bond

Question 7

Metal X is an element
Can it exsist as X2?

Answer 7

NO
all metals in element form exist by themselves

Question 8

desc why more covalent bonds = stronger bonds

Answer 8

1. more bonds, more shared electrons
2. more forces of attraction between nuclei of atoms, shared electrons

Question 9

X -> 2+
Y -> 1-

Why form compound
Xy2

Answer 9

1. X will transfer 2 VALENCE e- -> Y
2. Y can only take 1 VALENCE e-