Question

(CHEMISTRY)
Q:1 Helium atom has an atomic mass of 4u and two protons in its nucleus.How many neutrons
does it have?
(1)
Q:2 Write the electronic configuration of an element whose atomic number is 12. (1) 8
Q:3 The atomic number of lithium is 3.its mass number is 7
a) How many protons and neutrons are present in a lithium atom?
b) Draw the diagram of a lithium atom?
(3)
Q:4 What is the gold foil experiment? Name the scientist who performedthis experiment. Write
the conculsions and short comings of Rutherford's model of atom. 2
(5)

Answer 1

Answer:

here are ur three answers buddy