Which of the following correctly represents the electronic distribution in the Mg atom? - 2, 8, 2
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of - nucleus in the atom
Which of the following are true for an element? - (i) and (ii)
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion? - 10
The first model of an atom was given by - J.J. Thomson
An atom with 3 protons and 4 neutrons will have a valency of - 1
Which of the following statement is always correct? - An atom has equal number of electrons and protons.
Which of the following statements about Rutherford’s model of atom are correct? - Considered the nucleus as positively charged.
How many electrons are present in M-shell of an element with atomic number 20? - 8
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion? - 10
An alpha particle is also known as: - a doubly-charged helium ion
Ion containing positive charge is called - cations
The first orbit or shell is represented by letter - K
Uncharged particle present in atom is called - Nutron
Atomic mass is sum of masses of .......... & ........... - Neutron , Proton
How many electron occupy in K shell. - 2
The maximum number of electron is any orbit is...... - 2n^2
How many electron present in K shell of Al? - 2
Zero valency element is always ....... - noble gas
How many neutron present in hydrogen? - 0
Valency of Boron is ............... - 3
An atom of each element has definite combining capacity is known as as - valaency
Mass number of Al is 26. How many proton present in nucleus? - 13
Which of the following isotope is used in the treatment of blood cancer? - P-32
Isobars do not differ in the number of - nucleons
The statement-atom is Indivisible and industrucktive was proposed by - Dalton
Who proposed an atom just like a Christmas puddlings? - J.J Thomson
Who carried out the alpha particles experiments to understand atomic structure? - Rutherford
What is nature of alpha particles - +ve
Most of the alpha particles moving straight through the gold foil. This observation explain-? - Most space inside the atom is empty.
Who discovered electrons? - J.J Thomson
What is charge on neutrons? - neutral
What is other name of cell or orbit? - energy level
