Three of Döbereiner were absent at the pillars of Newlands' Octave. For example: Elements like Lithium (Li), Potassium (K) and Sodium (Na) form the Dobereiner’s Triad but are also found in the...
(a) In Period 3 of the Periodic table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the brackets to complete the following statements:
(i) The element B would have (lower /higher) metallic character than A. (ii) The element A would probably have (lesser / higher) electron affinity than B. (iii) The element A would have...
(a) Metals are good _____________ (oxidising agents/reducing agents) because they are electron __________ (acceptors/donors).
(b) An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is: (i) 17 (ii) 11 (iii) 18 (iv) 20 (c) Rewrite the...
(a) Among the elements given below, the element with the least electronegativity is
(i) Lithium (ii) Carbon (iii) Boron (iv) Fluorine (b) The metals of Group 2 from top to bottom are Be, Mg, Ca, Sr and Ba. (i) Which of these elements will form ions most...
(a) Choose the correct answer from the choice given:
(i) Ionisation potential increases over a period from left to right because the A. Atomic radius and nuclear charge increase B. Atomic radius and nuclear charge decrease C. Atomic radius...
(a) Among the Period 2 elements, the element which has high electron affinity is
A. Lithium B. Carbon C. Chlorine D. Fluorine (b) Group No.1-1A2-IIA13-IIIA14-IVA15-VA16-VIA17-VIIA18-02nd periodLiDOJNe3rd periodAMgESiHM4th periodRTIQUY In the above...
(a) Choose the correct answer from the option:
An element in Period 3 whose electronic affinity is zero. A. Neon B. Sulphur C. Sodium D. Argon (b) Give reason: (i) The ionisation potential of the element increases across a period. (ii)...
(a) Give reasons – The oxidising power of elements increases from left to right along a period.
(b) Select the correct answer: (i) Across a period, the ionisation potential ………… [increases, decreases, remains the same] (ii) Down the group, electron affinity ………… [increases, decreases, remains...
(a) The number of electrons in the valence shell of a halogen is ………. A – 1, B – 3, C – 5, D – 7.
(b) Electronegativity across the period ………… [increases/decreases]. (c) Non-metallic character down the group ………… [increases/decreases]. (d) Atomic number of an element is 16. State (i) to which...
(a) Among Period 2 elements A, B, C and D, the one which has high electron affinity is
A. Lithium B. Carbon C. Fluorine D. Neon (b) Group No. ’s IAIIAIIIAIVAVAVIAVIIA012131415161718LiDOJNeAMgESiHKBCFGL Select from the table: (i) Which is the most electronegative? (ii) How...
Select the correct answer from the choices A, B, C, D which are given. Write down only the letter corresponding to correct answer. With reference to the variation of properties in the Periodic table, which of the following is generally true?
(a) Atomic size increases from left to right across a period. (b) Ionization potential increases from left to right across a period. (c) Electron affinity increases going down a group. (d)...
The elements of one short period of the periodic table are given below in order from left to right:
Li, Be, B, C, O, F, Ne (a) To which period do these elements belong? (b) One element of this period is missing. Which is the missing element and where should it be placed? (c) Place the three...
Parts (a) to (e) refer to change in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the correct answer.
(a) The non-metallic character of the elements: (i) Decreases (ii) Increases (iii) Remains the same (iv) Depends on the period (b) The electronegativity: (i) Depends on the number of valence...
Choose the word or phrase from the brackets which correctly completes each of the following statements:
(a) The element below sodium in the same group would be expected to have a …………… (lower/higher) electro-negativity than sodium, and the element above chlorine would be expected to have a...
The electronegativities (according to Pauling) of the elements in Period 3 of the Periodic Table are as follows with elements arranged in alphabetical order:
AlClMgNaPSSi1.531.20.92.12.51.8 Arrange the elements in the order in which they occur in the periodic table from left to right. (The group 1 element first, followed by the group 2 element and so on,...
Which element from the following has the highest ionization energy?
(a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar Explain your choice. Answers: (a) Cl has the highest ionization energy. Normally, non-metals have high ionisation energy when...
Arrange the following in order of increasing radii:
(a) Cl¯, Cl (b) Mg2+, Mg, Mg+ (c) N, O, P Answers: (a) Cl < Cl¯ (in order of increasing radii) (b) Mg2+ < Mg+ < Mg (in order of increasing radii) (c) O...
First Ionization enthalpy of two elements X and Y are 500 kJ/mol-1 and 375 kJ /mol -1 respectively. Comment about their relative position in a group as well in a period.
The ionization enthalpy of an element is the minimum amount of energy needed to remove the outermost electron from a gaseous neutral atom. Given, The relative position in a group: X is above the Y...
Choose the most appropriate answer from
[SO2, SiO2, Al2O3, CO, MgO, Na2O] (a) A covalent oxide of a metalloid. (b) An oxide which when dissolved in water forms acid. (c) A basic oxide. (d) An amphoteric oxide. ...
Chorine in the Periodic Table is surrounded by the elements with atomic number 9, 16, 18 and 35.
(a) Which of these have physical and chemical properties resembling chlorine? (b) Which is more electronegative than chlorine? Answers: (a) The elements having the atomic number of 9 and 35 have...
Arrange the following as per instructions given in the brackets.
(a) Mg, Cl, Na, S, Si (increasing order of atomic size) (b) Cs, Na, Li, K, Rb (increasing metallic character) (c) Na, K, Cl, S, Si (increasing ionisation potential) (d) Cl, F, Br, I...
Name
(a) An alkali metal in period 3 and halogen in period 2 (b) The noble gas with 3 shells (c) The non-metals present in period 2 and metals in period 3. (d) The element of period 3...