The atomic number of an element X is 13. What will be the number of electrons in its ion X³⁺ ?(a) 11 (b) 15 (c) 16 (d) 10

Academic Chemistry NCERT Class 9

Correct Answer: (d) 10

Explanation: If the atomic number of X is 13, the number of electrons in its X³⁺ ion would be 13 – 3 = 10.

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

37 Views

The atomic number of an element E is 16. The number of electrons in its ion E2– will be :(a) 16 (b) 18(c) 15 (d) 14
If the number of electrons in an ion Z3– is 10, the atomic number of element Z will be :(a) 7 (b) 5 (c) 10 (d) 8
The number of electrons in an ion Y2+ is 10. The atomic number of element Y is most likely to be :(a) 8 (b) 12 (c) 10 (d) 14
The ion of an element has 3 positive charges. The mass number of atom of this element 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
The atom of an element X has 7 electrons in its M shell.(a) Write the electronic configuration of element X.(b) What is the atomic number of element X?(c) Is it a metal or a non-metal?(d) What type of ion will be formed by an atom of element X? Write the symbol of the ion formed.(e) What could element X be?
The number of valence electrons in a sulphide ion, S2–, is :(a) 16 (b) 10 (c) 9 (d) 8
The atomic number of an element X is 16.(a) Write down the electronic configuration of X.(b) What will be the valency of X ?
The atom of an element X contains 17 protons, 17 electrons, and 18 neutrons whereas the atom of an element Y contains 11 protons, 11 electrons, and 12 neutrons.(a) What type of ion will be formed by an atom of element X ? Write the symbol of the ion formed.(b) What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from X?(c) What type of ion will be formed by an atom of element Y ? Write the symbol of the ion formed.(d) What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from Y?(e) What is the atomic mass of (i) X, and (ii) Y?(f) What could the elements X and Y be?
(a) The atomic number of sodium is 11. What is the number of electrons in Na+?(b) The atomic number of chlorine is 17. What is the number of electrons in Cl-?
(a) Define valency of an element. What valency will be shown by an element having atomic number 14?(b) What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.
Number of valence electrons in Cl- ion are:(a) 16(b) 8(c)17(d) 18.
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?31X1531X1616X1515X16
The number of electrons in the atom of an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of an atom of this element ?(a) 3115X (b) 3116X (c) 1615X (d) 1516X
The atomic number of sodium is 11 and its mass number is 23. It has(a) 11 neutrons and 12 protons (b) 12 protons and 11 electrons(c) 11 electrons and 12 neutrons (d) 12 electrons and 11 neutrons.
‘‘Atomic number of an element is considered to be a more appropriate parameter than its atomic mass for a chemist.’’ Take the example of the element X (atomic number 13) to justify this statement.

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements