Elements arrangements In The Periodic Table C1

Question 1

What order are elements in on the periodic table

Answer 1

Atomic number

Question 2

What is similar about elements in the same group

Answer 2

Elements present in the same group have the same number of valence electrons. Therefore, elements present in the same group have similar physical and chemical properties.

Question 3

In terms of electron structure, why do elements in the same group share similar properties?

Answer 3

They have similar properties because they have the same
number of electrons in their outer shell.

Question 4

What order were the elements initially arranged in the periodic
table

Answer 4

Atomic weight

Question 5

What was the main problem with this arrangement of the periodic table with gaps in it

Answer 5

Not all elements had been discovered yet so some elements ended up in the wrong group

Question 6

What did Mendeleev do to try overcome this problem of the arrangement of the periodic table

Answer 6

Left gaps. Changed the order in some places.

Question 7

What evidence proved that Mendeleev was right?

Answer 7

Elements he predicted for the gaps were discovered. Knowledge of isotopes explained why ordering on weight didn’t always work