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

Academic Chemistry NCERT Class 9

Correct Answer: (b) 12

Explanation: The number of electrons in an ion Y2+ is 10. The atomic number of element Y is 12.

Tutorialspoint

Updated on: 10-Oct-2022

197 Views

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 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
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
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 number of valence electrons in a sulphide ion, S2–, is :(a) 16 (b) 10 (c) 9 (d) 8
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?13101416
An element X with atomic number 12 forms a compound with element Y with atomic number 17. The formula of the compound formed is (A) XY (B) XY2 (C) X2Y (D) X2Y3
Which of the following elements will form an acidic oxide?(a) An element with atomic number = 7(b) An element with atomic number = 3(c) An element with atomic number = 12(d) An element with atomic number = 19
An element ‘X’ with atomic number 11 forms a compound with element ‘Y’ with atomic number 8. The formula of the compound formed is(a) XY (b) X2Y(c) XY2 (d) X2Y3
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-?
Number of valence electrons in Cl- ion are:(a) 16(b) 8(c)17(d) 18.
One equation of a pair of dependent linear equations is \( -5 x+7 y=2 \). The second equation can be(A) \( 10 x+14 y+4=0 \)(B) \( -10 x-14 y+4=0 \)(C) \( -10 x+14 y+4=0 \),b>(D) \( 10 x-14 y=-4 \)
The nucleus of an atom has 5 protons and 6 neutrons. What would be the (a) atomic number, (b) mass number, (c) the number of electrons, and (d) the number of valence electrons, per atom of this element?
(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.

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements