Chemistry
Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
(i) State which one is (1) a non-metal; (2) a metal; (3) chemically inert.
(ii) Write down the formula of the compound formed by two of the above elements.
Related Questions
The atom of aluminium is represented by 27Al13. Write down the number of :
(a) electrons
(b) protons
(c) neutrons
(d) the arrangement of electrons
in the different orbits or shells in one atom of aluminium.
Name the element which does not contain any neutrons in it's nucleus.
Define : Proton, Electron, Neutron.