Atomic STR and Periodic Table MCQs
Atomic STR and Periodic Table MCQs
Atomic STR and Periodic Table MCQs
1. Which of the following correctly represents the electronic distribution in the Mg atom?
(a) 3, 8, 1
(b) 2, 8, 2
(c) 1, 8, 3
(d) 8, 2, 2
2. The number of electrons in an element X is 15 and the number of neutrons is 16. Which of
the following is the correct representation of the element?
4. Nucleons is
(a) Total no. of protons
(b) Total no. protons and electrons
(c) Total no. of neutrons
(d) Total no. protons and neutrons
5. 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?
(a) 13
(b) 10
(c) 14
(d) 16
10. Indicate the number of electrons, protons and neutrons in the element .
(a) e = 19, p = 19, n = 20
(b) e = 18, p = 19, n = 19
(c) e = 19, p = 20, n = 20
(d) e = 19, p = 19, n = 19
11. . In an atom valence electron are present in:
(a)Outermost orbit
(b)Next to outermost orbit
(c)First orbit
(d)Any one of its orbit
12. What is the number of valence electrons of AI?
(a)1
(b)2
(c)3
(d)4
13. The nucleus of an atom contains:
(a)Protons
(b)Electrons
(c)Protons and neutrons
(d)Neutrons
14. Which of the following electronic configurations is wrong?
(a) Be = 2, 2
(b) S = 2, 6, 8
(c) P = 2, 8, 5
(d) O = 2, 6
15. Which of the following statement is always correct?
(a) An atom has equal number of electrons and protons.
(b) An atom has equal number of electrons and neutrons.
(c) An atom has equal number of protons and neutrons.
(d) An atom has equal number of electrons, protons and neutrons.
16. The following atom is of
(a) Neon
(b) Magnesium
(c) Sodium
(d) Aluminium
17. How many electrons are present in valance shell of Chlorine?
(a) 6
(b) 7
(c) 8
(d) 2
18. Group 2 consists of
(a) Alkaline Earth metals (b) Halogens
(c) Alkali Metals (d) Noble metals
19. Elements are arranged in order of
(a) decreasing atomic number
(b) decreasing atomic mass
(c) increasing atomic number
(d) none of the above
20. What type of sharing is present in covalent bond?
(a) Neutron (b) Proton (c) Electron (d) All of the above
21. How are the elements of a period arranged in the periodic table from left to right?
(a) Atomic number (b) Atomic mass (c) Isotopes (d) Outer level electron
22. How are the elements of a period arranged in the periodic table from left to right?
a. Atomic number
b. Atomic mass
c. Isotopes
d. Outer level electrons
23. Which statement about metals and non-metals in the periodic table is true?
a. There are more non-metal elements than metal elements
b. Metals are on the left of the periodic table and non-metals are on the right.
c. Metals are on the right of the periodic table and non-metals are on the left.
d. None of the above
24. What change occurs to an atom when it forms a negative ion?
a. It loses electrons
b. It gains protons
c. It gains electrons
d. It loses protons
25. Which noble gas has the same electronic structure as Al3+ ion?
a. Krypton b. Neon
c. Helium d. Argon
26. Dot diagram are used to represent
a. Atomic number
b. Atomic mass
c. Isotopes
d. Outer level electrons
27. Which options correctly describes the relative charges and masses of the subatomic
particles?
31. Which of the following does not match the characteristics of an Isotope?