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A particular element A has one electron in its third shell. There is another element B with six electrons in its second shell. (i) How many electrons does A tend to give or take to become stable? (ii) What kind of ion would it form? (iii) How many electrons does B tend to give or take to become stable? (iv) What kind of ion would it form? (v) If A and B were to combine, what kind of bond would be formed? (vi) What would be the formula for the compound thus formed?
Element A has one valence electron, so it loses one electron to achieve an octet, forming a positive cation A+. Element B has six valence electrons and requires two electrons to complete its outer octet, forming a negative anion B2-. The transfer of electrons creates an ionic bond between them. BalaRead more
Element A has one valence electron, so it loses one electron to achieve an octet, forming a positive cation A+. Element B has six valence electrons and requires two electrons to complete its outer octet, forming a negative anion B2-. The transfer of electrons creates an ionic bond between them. Balancing their positive and negative charges gives the chemical formula A2B.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessAn element X has six electrons in its outer shell and forms a diatomic molecule. (i) Why would that be so? (ii) What kind of bond would it form? (iii) Draw the structure of the molecule it would form. (iv) A certain other element Y has two electrons in its second shell. Draw the structure of the molecule that X would form with Y.
Element X contains six valence electrons, meaning it requires two additional electrons to attain a stable octet configuration. Two X atoms achieve stability by sharing two pairs of electrons, resulting in a double covalent bond. When X reacts with element Y having two valence electrons, they share oRead more
Element X contains six valence electrons, meaning it requires two additional electrons to attain a stable octet configuration. Two X atoms achieve stability by sharing two pairs of electrons, resulting in a double covalent bond. When X reacts with element Y having two valence electrons, they share or transfer two electrons, yielding the stable compound Y double bond X or YX.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessYou want to design a new ionic compound, where the total positive charge is 6+ and the total negative charge is 6-. Which of the following combinations gives the correct number of ions? (i) 2 Al3+ and 3 Cl- (ii) 3 Mg2+ and 1 PO4 3- (iii) 2 Fe3+ and 3 O2- (iv) 3 Ca2+ and 2 SO4 2-
Option (iii) is the correct answer. In this combination, two ferric ions Fe3+ contribute a positive charge calculated as two multiplied by plus three, totaling plus six. Three oxide ions O2- contribute a negative charge calculated as three multiplied by minus two, totaling minus six. This perfectlyRead more
Option (iii) is the correct answer. In this combination, two ferric ions Fe3+ contribute a positive charge calculated as two multiplied by plus three, totaling plus six. Three oxide ions O2- contribute a negative charge calculated as three multiplied by minus two, totaling minus six. This perfectly satisfies the requirement of having a total 6+ positive charge and 6- negative charge.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessChoose the correct statement(s) and correct the false statement(s). (i) Elements are made up of molecules and compounds are made up of atoms. (ii) The molecule of a compound is always made up of two or more atoms of the same kind. (iii) One molecule of nitrogen gas contains three nitrogen atoms. (iv) Water is made of two hydrogen atoms, covalently bonded with one oxygen atom.
Statement (iv) is correct because water contains two hydrogen atoms bonded covalently to one oxygen atom. Statement (i) is false because elements consist of identical atoms, whereas compounds consist of combined atoms. Statement (ii) is false because compound molecules contain different types of atoRead more
Statement (iv) is correct because water contains two hydrogen atoms bonded covalently to one oxygen atom. Statement (i) is false because elements consist of identical atoms, whereas compounds consist of combined atoms. Statement (ii) is false because compound molecules contain different types of atoms. Statement (iii) is false because a molecule of nitrogen gas contains two nitrogen atoms, not three.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
See lessWrite the chemical formulae for the following compounds. (i) Aluminium nitrate (ii) Calcium oxide (iii) Ferric oxide
Aluminium ion Al3+ combines with nitrate NO3- to give aluminium nitrate Al(NO3)3. Calcium ion Ca2+ combines with oxide ion O2- in a one-to-one ratio to form calcium oxide CaO. Ferric ion Fe3+ combines with oxide ion O2- through criss-crossing valencies to form ferric oxide Fe2O3. All three formulaeRead more
Aluminium ion Al3+ combines with nitrate NO3- to give aluminium nitrate Al(NO3)3. Calcium ion Ca2+ combines with oxide ion O2- in a one-to-one ratio to form calcium oxide CaO. Ferric ion Fe3+ combines with oxide ion O2- through criss-crossing valencies to form ferric oxide Fe2O3. All three formulae ensure overall electrical neutrality of the ionic compounds.
For more NCERT Solutions of Class 9 Science Exploration Chapter 9 Atomic Foundations of Matter Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-9/
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