(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^-?

Academic Chemistry NCERT Class 10

(a) No. of electrons present in Na⁺= 10

(As the atomic number of sodium is 11, Na⁺ will have one less electron.)

(b) No. of electrons in Cl^- = 18

(As the atomic number of chlorine is 17, Cl^- will have one more electron.)

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

96 Views

What is the number of valence electrons in :(a) sodium ion, Na+(b) oxide ion, O2–
Write down the electron distribution of chlorine atom. How many electrons are there in the L shell? (Atomic number of chlorine is 17).
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.
What is the atomic number of argon?
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
What is the Atomic Number?
If the number of electrons in an atom is 8 and number of protons is also 8, then(i) What is the atomic number of the atom? and(ii) What is the charge on the atom?
(a) What are valence electrons? Where are valence electrons situated in an atom?(b) What is the number of valence electrons in the atoms of an element having atomic number 13? Name the valence shell of this atom.
The number of protons and electrons are same in an atom. Then why is it wrong to say that atomic number of an atom is equal to its number of electrons?
The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it.
(a) What is the number of valence electrons in the atoms of first element in a period?(b) What is the usual number of valence electrons in the atoms of the last element in a period?
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) Describe the Rutherford's model of an atom. State one drawback of Rutherford's model of the atom.(b) The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
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
In electron dot structure, the valence shell electrons are represented by crosses or dots.(a) The atomic number of chlorine is 17. Write its electronic configuration.(b) Draw the electron dot structure of chlorine molecule.

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements