Chemistry
Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one :
(i) forms anion – negative ion;
(ii) forms cation – positive ion;
(iii) has 4 electrons in the outermost orbit.
Atomic Structure
81 Likes
Answer
X[6] = Electronic configuration [2,4]
Y[9] = Electronic configuration [2,7]
Z[12] = Electronic configuration [2,8,2]
(i) Y gains one electron to attain a stable octet, hence becomes negatively charged anion.
(ii) Z loses two electrons to attain a stable octet hence becomes positively charged cation.
(iii) X has 4 electrons in the outer most shell.
Answered By
54 Likes
Related Questions
Chlorine is an element of atomic number 17. It is a mixture of two isotopes having mass number of 35 and 37.
(i) What is meant by 'atomic number of an element' ? What do you understand by an 'atom'.
(ii) Write down the electronic configuration of the chlorine atom.
(iii) State the number of protons, electrons and neutrons in the following isotopes: ,
(iv) Explain why the two atoms in (iii) above have the same chemical reactions.
(v) If molten magnesium chloride is electrolyzed suggest a suitable electrode [anode].
Five atoms are labelled V to Z
Atoms Mass Number Atomic number V 40 20 W 19 9 X 7 3 Y 16 8 Z 14 7 (i) Which one of these atoms (1) contains 7 protons; (2) has an electronic configuration 2, 7 ?
(ii) Write down the formula of the compound formed by atoms X and Y.
Ordinary chlorine gas has two isotopes : and in the ratio of 3 : 1. Calculate the relative atomic mass [atomic weight] of chlorine.
The atom of aluminium is represented by 27Al13. Write down the number of :
(a) electrons
(b) protons
(c) neutrons
(d) the arrangement of electrons
in the different orbits or shells in one atom of aluminium.