StudentAidUnit 2: Atomic Structure — Mcqs
9th Class Chemistry · Unit 2: Atomic Structure
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Multiple Choice Questions (Exercise)
1.How many electrons can be accommodated at the most in the third shell of the elements?
2.What information was obtained from discharge tube experiments?
3.Why have isotopes not been shown in the periodic table?
4.Which particle is present in different number in the isotopes?
5.In which isotope of oxygen there are the equal number of protons, electrons and neutrons?
6.What will be the relative atomic mass of nitrogen given the abundances of its two isotopes, 14N and 15N are 99.64 and 0.35 respectively
7.How is radio carbon dating useful for archeologists?
8.What does keep the particles present in the nucleus intact?
9.How do electrons keep themselves away from the oppositely charged nucleus?
10.Rubidium consists of two isotopes 85Rb and 87Rb. The percent abundance of the light isotope is 72.2% What is the percent abundance of the heavier isotope? Its atomic mass is 85.47.
Structure of Atom
11.M shell has sub-shells:
12.A sub-shell that can accommodate 6 electrons is:
13.John Dalton put forward his atomic theory:
14.Rutherford used a gold foil in his experiment, which had a thickness of:
- a 0.002cm
- b 0.0004cm
- c 0.0001cm
- d 0.001cm
15.Who performed first experiment to split atom?
16.According to Rutherford's atomic theory, atom should produce:
17.Quantum means:
- a Variable energy
- b Fixed energy
- c High energy
- d Minimum energy
18.The relative atomic mass of proton is:
19.The relative atomic mass of neutron is:
20.The relative atomic mass of electron is:
21.Protons are deflected toward plate:
22.The nucleus of an atom is composed of:
23.How many electrons can be accommodated in s subshell?
24.Number of electrons that can be accommodated in f-subshell:
25.Which subshells are present in L-shell?
26.How many subshells are there in M-shell?
27.N-shell contains number of subshells:
28.An element has 5 electrons in M-shell. Its atomic number is:
29.d-subshell can accommodate maximum electrons:
30.The removal of electron from a neutral atom gives rise to:
31.How many electrons can be accommodated at the most in the third shell of the elements?
Atomic Number and Mass Number
32.Number of neutrons in ²⁷₁₃M are:
33.Number of protons in the nucleus of an atom is called:
34.Atom is electrically:
35.Atomic number is represented by:
36.²³⁸₉₂U has number of neutrons:
37.Mass number is represented by:
Isotopes and their Masses
38.Which of the following statement is not correct about isotopes?
39.Which isotope is used in nuclear reactors?
40.Chlorine has two isotopes, both of which have:
41.Which isotope is commonly used to irradiate cancer cells?
42.Number of isotopes of hydrogen is:
43.Symbol for Deuterium is:
44.¹³C and ¹⁴C are both present in nature:
45.The percentage of ²³⁵U is found in nature:
46.Which isotope is used for diagnosis of goiter?
47.Carbon-14 is used for the:
48.Mass of Proton in amu is:
49.Predict the boiling point of heavy water (D₂O).
50.What will be the relative mass of hydrogen given the abundances of its two isotopes, 99.9844% and 0.0156% ?