Question

In the modern periodic table elements are
arranged in order their increasing:
a. Valence
b. Mass number
C. Valence electron
d. Charge on nucleus

Answer 1

Answer:

Mass number

Hope this is useful !

Answer 2

Answer:

a.) Elements are arranged from left to right and top to bottom in order of increasing atomic number. orter generally coincides with increasing atomic mass. the rows are called periods