Question

The arrangement of the elements from left to

right in Period 4 on the Periodic Table is based on
(1) atomic mass
(2) atomic number
(3) the number of electron shells
(4) the number of oxidation states

Answer 1

It is bases on "Atomic number"

In short, Your Answer would be Option B

Hope this helps!

Answer 2

Answer: Option (2) is the correct answer.

Step-by-step explanation:

Elements in a periodic table are placed according to increasing atomic number when we move from left to right.

Atomic mass is the sum of total number of protons and neutrons present in an atom. Whereas atomic number is the sum of only total number of protons present in an atom.

Elements of period 4 are K, Ca, Sc, Ti, V, Cr, Mn, Fe etc. Atomic mass of these elements increases when we move from left to right.

Therefore, we can conclude that the arrangement of the elements from left to right in Period 4 on the Periodic Table is based on atomic number.