Free help with homework

Why join Brainly?

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

Two elements ‘A’ and ‘B’ have same number of

electrons in their valence shells. The number of
electrons present in the second last shell of atom ‘A’
is two times the number of electrons present in the
second shell of atom ‘B’. A and B respectively are
(1) Aluminium and phosphorus
(2) Magnesium and calcium
(3) Silicon and carbon
(4) Oxygen and sulphur


Mg and ca is the answer . Mg and ca
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