1. The mass of a hydrogen atom is ------------------ kg. (JEE 1982)
answer: 1.66*10^-27 kg
2. When there are two electrons in the same orbital, they have ---------------- spins. (JEE 1982)
Answer: opposite or antiparallel
3. Isotopes of an element differ in the number of ______________ in their nuclei. (JEE 1982)
Anwer: neutrons
4. Elements of same mass number but of different atomic numbers are known as ----------.
(JEE 1983)
Answer: isobars
5. Fill in the blanks choosing appropriate words given with brackets)
the uncertainty principle and the concept of wave nature of matter were proposed by ----------------- and -------------------- respectively
(Heisenberg, Schrodinger, Maxwell, de Broglie)
(JEE 1988)
Answer: Heisenberg, de Broglie
answer: 1.66*10^-27 kg
2. When there are two electrons in the same orbital, they have ---------------- spins. (JEE 1982)
Answer: opposite or antiparallel
3. Isotopes of an element differ in the number of ______________ in their nuclei. (JEE 1982)
Anwer: neutrons
4. Elements of same mass number but of different atomic numbers are known as ----------.
(JEE 1983)
Answer: isobars
5. Fill in the blanks choosing appropriate words given with brackets)
the uncertainty principle and the concept of wave nature of matter were proposed by ----------------- and -------------------- respectively
(Heisenberg, Schrodinger, Maxwell, de Broglie)
(JEE 1988)
Answer: Heisenberg, de Broglie
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