periodic table

Question 1

how are elements arranged on the modern periodic table

Answer 1

in order of increasing atomic numbers (increasing protons in the nucleus)

Question 2

periodicity

Answer 2

repeating pattern of trends across different periods

Question 3

elements in a group

Answer 3

have similar chemical and physical properties and their atoms have the same number of outer shell electrons

Question 4

conductors of electricity?
metals
non metals
metalloids

Answer 4

metals - yes
non metals - no
metalloids - yes

Question 5

trends in atomic radii across a period

Answer 5

protons are added to the nucleus so nuclear charge increases
electrons are added to the same shell
nuclear attraction on outer shell electron increases across a period
electron shells are drawn inwards by nucleus making atoms smaller
trend is atomic radius decreases across a period from left to right

Question 6

trends in atomic radii down a group

Answer 6

number of shells increases
outer electron is added to a new shell which is further away from the nucleus
shielding effect by inner shell electrons increases down a group
increase in distance of the outermost electron from the nucleus and the shielding effect far outweigh increase in nuclear charge (number of protons)
nuclear attraction on outermost electron decreases down a group

Question 7

melting and boiling points depend on the

Answer 7

structure of a substance and the strength of the bonds which needs to be broken

Question 8

a substance has a high melting or boiling point if

Answer 8

the bonds broken are strong
the structure if the substance is giant

Question 9

a substance has a low melting and boiling point if

Answer 9

the bonds are weak
the structure of the substance is simple