There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as
Isotopes-These are atoms of the elements having the same atomic number but different mass number., Isobars-These are atoms of same mass number but different atomic number., Isotones-These are atoms of different elements having same number of neutrons.
A sentence has been given in Active/Passive Voice. Out of the four given alternatives, select the one which best expresses the same sentence inPassive/Active Voice.
Some girls were helping the wounded men.
A) The wounded men were helping some girls.
B) The wounded men were being helped by some girls.
C) The wounded men are being helped by some girls.
D) The wounded men received help from some girls.
A) The wounded men were helping some girls.
B) The wounded men were being helped by some girls.
C) The wounded men are being helped by some girls.
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