periodocity period 3

Question 1

what is periodocity

Answer 1

trend in properties of elements across a period which is repeated across the next period

Question 2

what is the trend in atomic radius across a period

Answer 2

it decreases as the nuclear charge increase stronger electrostatic forces of attraction between nucleas and outer electrons for same shielding effect

Question 3

what is the general trend in ionisation energy

Answer 3

it increases as the nuclear charge increases for the same shielding effect more attraction between nucleas and outer electron so requires more energy to remove the electron

Question 4

what is a metallic bond

Answer 4

electrostatic forces of attraction between metal positive ions and delocalised electrons

Question 5

what affects the strength of metallic bond

Answer 5

the nuclear charge the number of delocalised electrons ansd the shielding effect

Question 6

why do metal lattice have high melting points

Answer 6

strong attraction between metal positive ions and delocalised electrins

Question 7

why is the melting point of sillicon very high

Answer 7

exist as macromolecular structure with covalent bonds very strong so require large amounts of energy to break the bonds

Question 8

why does the melting point increase in the simple molecular compounds

Answer 8

as the compunds get bigger more stronger vdw forces between the molecules so requires more energy to overcome the forces of atraction

Question 9

what is an ionic bond

Answer 9

electrostatic forces of attraction between oppositely charged ions

Question 10

what is the trend in electronegativity

Answer 10

increases as greater nuclear charge for the same shielding effect so greater attraction betwen nucleas and bonded pair of electrons