In periodic table, where the mass number or atomic mass of an element is written?
a) above the symbol
b) below the symbol
c) before the symbol
d) after the symbol
Which of the following formula tells you the number of neutrons?
a) N=A-A
b) N=Z-A
c) N=A-Z
d) N=Z-Z
The number of electrons in an atom is equal to the………
a) number of neutrons
b) mass number
c) number of protons
d) nucleon number
The atomic number of oxygen is eight. How many electrons are present in an atom of oxygen?
a) 7
b) 8
c) 16
d) 32
An atom has atomic number 9 and mass number 19. How many protons are present in that atom?
a) 9
b) 10
c) 19
d) zero
An atom has atomic number 9 and mass number 19. How many electrons are present in that atom?
a) 9
b) 10
c) 19
d) zero
