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

wat is stable config for electrons

Answer 3

2.8.8

Question 4

what is an ion

Answer 4

electrically charged atom/group of atoms formed by loss/gain of electrons

Question 5

Why won’t noble gas react

Answer 5

noble gas is stable, will not chemically react

Question 6

fill in the blanks

metals ___ electrons
nonmetals ___ electrons

Answer 6

metals lose electrons -> postively charged (cations)
nonmetals gain electrons -> negatively charged (anions)

Question 7

what are positive and negative ions held tgt by?

Answer 7

strong electrostatic forces of attraction

Question 8

what is the bond between 2 ions called

Answer 8

ionic bonds

NOT strong electrostatic forces of attraction coz’ that is what holds them together, not what the bond is called.

Question 9

what determines number of covalent bonds between atoms?

Answer 9

number of pairs of shared electrons

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

Question 10

Metal X is an element
Can it exsist as X2?

Answer 10

NO
all metals in element form exist by themselves