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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

How many electrons are in a strontium atom (Sr)? Does an atom of Sr gain or lose electrons when forming an ion? How many electrons are gained or lost by the atom? When Sr forms an ion, the ion has the same number of electrons as which one of the noble gases?

Interpretation Introduction

Interpretation:

The given question related with strontium atom (Sr ) should be answered on the basis of electrons and electronic configuration.

Concept introduction:

  • When the number of electron and proton in the atom is same the atom will be electrically neutral. Therefore in a neutral atom the number electrons are equal to its atomic number.
  • The loss or gain of electrons from an atom forms monoatomic ion in order to achieve the stability (noble gas electronic configuration, etc.)
  • Strontium has 38 electrons.
  • The charge of Strontium ion (Sr2+) is +2.
Explanation

The loss or gain of electrons from an atom forms monoatomic ion. Strontium atom is a group 2, element so highly electropositive atom; therefore, they loss two electron to form ion.

Hence, Strontium atom loss two electron so that they fulfil the octet rule or the noble gas electronic configuration.

Strontium has 38 electrons.

Strontium loss two electrons to form Strontium ion, the electronic configuration of Sr2+ is,

    1s22s

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