Question

How are the periods, or horizontal rows, on a periodic table ordered from left to right?

by increasing number of protons.

by decreasing number of neutrons.

by similar state of matter.

by similar number of valence electrons.

Answer 1

@asib1214

Answer 2

@Somy

Answer 3

@radar @esshotwired @Squirrels @ganeshie8 @ikram002p

Answer 4

what do u think?

Answer 5

there is a very obvious option
the rest are absolutely wrong

Answer 6

the first one!

Answer 7

bingo :)

Answer 8

thank you!