Calculate the number of electrons, protons and neutrons in an atom of an element with atomic number 20 and mass number 40. Write the electronic configuration and draw the structure of the atom.
Answers
Answered by
3
Answer:
Atomic number = 20
therefore the no. of protons = 20
no. of neutron = mass no. - proton no.
40 - 20 = 20
we know that
No of proton = no of electron
20 = 20
electronic configurations
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
it is an alkali metal
Calcium
Attachments:
Answered by
2
Answer:
The mass number of an isotope is the sum of the number of protons and neutrons in the atomic nucleus. The atomic number is the number of protons. The calcium-40 isotope has a mass number of 40 , and an atomic number of 20 , therefore it has 20 protons.
Similar questions