The atomic number of an element A is 16.
- What must an atom of A do to achieve the nearest inert gas electron configuration?
- Which inert gas is nearest to A?
(a) An atom of A must accept 2 electrons to achieve the nearest inert gas electron arrangement (2, 8, 8).
(b) Argon is the inert gas nearest to A.
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- Which inert gas electron configuration do the Cl atoms in Cl2 molecule resemble? What is this electron configuration?
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- Explain why an inert gas like Argon is filled in bulbs.
- Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how the valency of an element is calculated on the basis of its atomic number.
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- The electronic configuration of an element Z is 2, 8, 8.(a) What is the atomic number of the element?(b) State whether element Z is a metal or a non-metal.(c) What type of ion (if any) will be formed by an atom of element Z? Why?(d) What is special about the outermost electron shell of the atom of this element?(e) Give the name and symbol of element Z.(f) Name the group of elements to which Z belongs.
- Properties of the elements are given below. Where would you locate the following elements in the periodic table?(a) A soft metal stored under kerosene.(b) An element with variable (more than one) valency stored underwater.(c) An element which is tetravalent and forms the basis of organic chemistry.(d) An element which is an inert gas with atomic number 2.(e) An element whose thin oxide layer is used to make other elements corrosion-resistant by the process of “ anodising”.
- 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
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