Question

suppose an element have 12 protons 15 neutrons and 10 electrons. find out it atomic no And atomic mass​

Answer 1

Answer:

Atomic mass= n + p

=> 15 +12

=> 27

Atomic number= no of electrons = 10

Answer 2

Answer:

Atomic number is 12 and atomic mass is approximately 27 u.

Explanation:

Atomic number is always equal to the number of protons, and is equal to the number of electrons ONLY if  the species is neutral, i.e., number of protons and number of electrons are equal.

Electrons contribute much less to the atomic mass and they are often neglected when calculating atomic mass.

Each proton and neutron have a mass approximately equal to 1 unified mass (u) (formerly, atomic mass units (amu)).

As there are 12 protons (each weighing approximately 1 u) and 15 neutrons (each weighing approximately 1 u), the atomic mass is 27 u.