Question

An element contains one electron and it's mass number is 3. What is the atomic number of the element, it's name, number of protons and neutrons in its nuecleus?​

Answer 1

Answer:

atomic number = 1

it's name = deuterium ( Hydrogen )

number of protons = 1

number of neutrons = 2

Answer 2

Answer:

Across a period, effective nuclear charge increases as electron shielding remains constant. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius.