question_answer

  4.            Complete the following gaps in the given table:

Elements	Protons	Electrons	Neutrons	Atomic Number	Mass Number
A	-	-	10	8	-
B	15	-	-	-	31
C	1	-	-	-	3
D	-	11	12	-	-

Answer:

                  We know that the number of protons = Atomic number               Number of protons = Number of electrons   Mass number = Number of protons + number of neutrons Using these relationships, we can fill up these gaps as follows:

Elements	Protons	Electrons	Neutrons	Atomic Number	Mass Number
A	8	8	10	8	18
B	15	15	16	15	31
C	1	1	2	1	3
D	11	11	12	11	23