7.1 Periodic Table

Question 1

in what order did Mendeleev order the elements in the periodic table?

Answer 1

in order of atomic mass
and
grouped elements with similar chemical properties together

Question 2

in what order is the modern periodic table ordered in?

Answer 2

increasing atomic number
(proton number)

Question 3

what are the vertical columns?

Answer 3

groups

all elements in the same group have the same number of electrons in their outer shells

Question 4

what are the horizontal rows?

Answer 4

periods

all elements in the same period have the same number of shells

Question 5

what determines an element’s chemical properties?

Answer 5

the number of electrons in the outer shell

Question 6

what is periodicity?

Answer 6

a repeating trend in properties across a period

Question 7

examples of periodicity

Answer 7

electron configuration
ionisation energy
structure
melting point

Question 8

electron configuration

Answer 8

period 2 is the 2 sub-shells
period 3 is the 3 sub-shells

Question 9

how is the periodic table divided into blocks?

Answer 9

s
p
d
f