Structure of the atom Worksheet-2
A. Protons B. Electrons and neutrons
C. Protons and neutrons D. Neutrons
A. Negatively charged B. Positively charged
A. Cation B. Anion C. Atom
A. J. J. Thomson
B. E. Goldstein
C. James Chadwick
A. 2 and 8 B. 2 and 18 C. 2 and 32 D. 8 and 18
A. 14 B. 13 C. 27
A. 19 electrons, 19 protons and 20 neutrons
B. 19 electrons, 20 protons and 19 neutrons
C. 20 electrons, 19 protons and 19 neutrons
A. Mass number
B. Atomic number
C. Number of neutrons
(i) 8p + 8n (ii) 19p + 21n (iii) 8p +10n (iv) 20p + 20n.
A. (i)and (iii) isotopes , (ii)and (iv) isobars
B. (i)and (iv) isotopes , (ii)and (iii) isobars
C. (ii)and (iii) isotopes , (ii)and (iv) isobars
D. (iv)and (iii) isotopes , (ii)and (i) isobars
A. I-131 B. Cu-64 C. Bi-213 D. Co-60
Explanation: The nucleus of an atom consists of neutrons and protons.
Explanation: Alpha particles are made up of two protons and two neutrons hence these are positively charged particles.
Explanation: It has one unit positive charge (A+). The number of protons is more than the number of electrons.
Explanation: K and L shells of an atom can have maximum 2 and 8 electrons.
Explanation: Mass number is sum of number of protons and neutrons in an atom.
14 + 13 = 27
Explanation: Electrons = 19; protons = 19; neutrons = 20.
Explanation: Isotopes of an element have same atomic number.
Explanation: Atoms of an element having same atomic number but different mass number are called isotopes.
Atoms of different elements having same mass numbers (same number of nucleons) but different atomic numbers are called isobars.