Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

Calculate the number of elements, protons and neutrons in am atom of an element with atomic number 20 and mass number 40. write the electronic

configuration and draw the structure of the atom


The number of electrons in an atom is the same as its number of protons.
Since the atomic number is equal to the number of protons.
     no of protons = no of electron = 20
electronic configuration = (2,8,8,2)
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts