Question 2 :
If atomic number is 9 and number of neutrons is 10, then find number of electrons.
Question 3 :
If atomic number is 9 and number of neutrons is 10, then find name of the atomic species.
Question 4 :
Atomic number is defined as the total number of _______ present in the nucleus of an atom.
Question 5 :
If Bromine atom is available in the form of, say, two isotopes $^{79}_{35}Br$ (49.7%) and $^{81}_{35}Br$ (50.3%), calculate the average atomic mass of bromine atom.
Question 8 :
An isotope of iodine is used for making tincture iodine, which is used as a medicine.
Question 10 :
The mass number is defined as the sum of the total number of protons and electrons present in the nucleus of an atom. TRUE OR FALSE?
Question 11 :
If atomic number is 16, mass number is 32 and name of atomic species is Sulphur then find number of neutrons.
Question 12 :
Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?
Question 13 :
If atomic number is 16, mass number is 32 and name of atomic species is Sulphur then find number of electrons.
Question 14 :
It was observed that the atoms of elements, completely filled with 8 electrons in the outermost shell show little chemical activity. TRUE OR FALSE?
Question 15 :
The chemical properties of isotopes are similar but their physical properties are different. TRUE OR FALSE?
Question 16 :
According to Rutherford, Radius of the nucleus is about ____ times less than the radius of the atom.
Question 18 :
If mass number is 1, number of neutrons is 0, number of protons is 1 and number of electrons is 1 then find name of atomic species.
Question 19 :
Dalton’s atomic theory suggested that the atom was divisible and destructible. TRUE or FALSE ?
Question 20 :
If mass number is 2 and number of proton is 1, then find number of electrons.