Identify the term in each of the following : (i) The tendency of an atom to attract electrons to itself when combined in a compound. (ii) The electrons present in the outermost shell of an atom.
(i) Electronegativity. (ii) Valence Electrons.
Select the answer from A, B, C and D : An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is: (a) 17 (b) 11 (c) 18 (d) 20
17 Reason The element with atomic number 19 has electronic configuration of (2, 8, 8, 1) and that with atomic number 17 has electronic configuration of (2, 8, 7). This…
The metals of Group 2 in the periodic table from top to bottom are — Be, Mg, Ca, Sr, and Ba. (i) Which one of these elements will form ions most readily. Give reasons. (ii) State the common feature in the electronic configuration of all these given elements.
(i) Ba - Elements at the bottom of a group are most metallic, have large atomic size and lowest ionisation potential. So, the outer electrons are loosely held and will form ions…
Select a covalent oxide of a metalloid from the following — SO2 , SiO2, Al2O3, MgO, CO, Na2O.
SiO2 is a covalent oxide of a metalloid.
Arrange the elements as per the instructions : (i) Cs, Na, Li, K, Rb (increasing order of metallic character). (ii) Mg, Cl, Na, S, Si (decreasing order of atomic size). (iii) Na, K, Cl, S, Si (increasing order of ionization energy) (iv) Cl, F, Br, I (increasing order of electron affinity)
(i) Li < Na < K < Rb < Cs (ii) Na > Mg > Si > S > Cl (iii) K < Na < Si < S < Cl…
The element with the least electronegativity is : (a) Lithium (b) Carbon (c) Boron (d) Fluorine
Lithium Reason Electronegativity increases from left to right. As Lithium is on the left side in periodic table hence it is the least electronegativity among the given options.
Match the option – A : Metal or B : Iron – with the statements (i) and (ii) : (i) The metal which forms two types of ions (ii) An element with electronic configuration 2, 8, 8, 3
(i) The metal which forms two types of ions — B : Iron (ii) An element with electronic configuration 2, 8, 8, 3 — A : Metal
Give a phrase for : Amount of energy released when an atom in the gaseous state accepts an electron to form an anion.
Electron affinity is the amount of energy released when an atom in the gaseous state accepts an electron to form an anion.
In the activity series of metals — M is a metal above hydrogen in the activity series and it’s oxide has the formula M2O. M2O when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following : (i) What kind of combination exists between M and O? (ii) State the number of electrons in the outermost shell of M ? (iii) Name the group to which M belongs.
Given, M is a metal (i) Electrovalent bond exits between M and O because the bond is formed between a metal and non-metal due to oppositely charged ions. (ii) Number of electrons…
Atomic number of element Z is 16 (i) State the period and group to which Z belongs. (ii) Is Z a metal or a non-metal? (iii) State the formula of the compound between Z and hydrogen. (iv) What kind of a compound is this?
(i) The element belongs to 3rd period and 16 [VI A] group. Reason The element Z has atomic number 16 and so the electronic configuration will be 2, 8, 6.…