Question

Choose the correct answer.
1. An atom has no overall charge if it contains equal number of
a)electrons and neutrons
b) Electrons and Protons c)protons and neutrons
d)Positrons and neutrons
2. Isotopes are found because atoms of the same element can have different number of
a) Protons
b) Electrons
c)Neutrons
d)None of these
3. In the chemical formula CO2, the subscript 2 shows which of the following
a)There are two oxygen ions
b) There are two oxygen atoms
c)There are two carbon atoms
d)There are carbon dioxide molecules
4. The atomic number of fluorine (F) is 9. Its mass number is 19.How many neutrons are present in
its atom?
a) 7
b) 8
c)9
d)10
5. The number of electrons in N shell can be
a)2
b)8
c)18
d)32​

Answer 1

Answer:

1) b

2) c

3) b

4)d

5) d

Explanation:

Answer 2

an auto has no overall charge if it contains equal number of electrons and protons