Question

State how are the elements of a period arranged in the modern periodic table, from left to right.

a:In order of increasing atomic mass
b:In order of increasing atomic number
c:In order of decreasing atomic mass

Answer 1

Answer: B

Step-by-step explanation:

The atomic number of an element is the number of protons in the nucleus of an atom of that element. Changing the number of neutrons means you get an isotope of the same element. Changing the number of electrons does not affect the atom but affects the charge of the atom. So the periodic table is arranged by increasing the number of protons or atomic numbers.