Give alongside is a part of the periodic table :
As we move horizontally from left to right:

Li Be B C N O F
Na Mg Al Si P S Cl

(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?

Academic Chemistry NCERT Class 10

(i) The metallic property of elements decreases as we move horizontally from left to right.

(ii) The atomic size of elements decreases as we move horizontally from left to right.

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Updated on: 10-Oct-2022

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Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al.Cl > Si > Al > Mg > NaNa > Mg > Al > Si > ClNa > Al > Mg > Cl > SiAl > Na > Si > Ca > Mg
What happens to the metallic character of the elements as we go down in a group of the periodic table?
(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?(b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?
Can the following groups of elements be classified as Dobereiner's triads?(a) Na, Si, Cl (b) Be, Mg, Ca Give reason for your answer. (Atomic masses : Be 9 ; Na 23 ; Mg 24 ; Si 28 ; Cl 35.5 ; Ca 40)
(a)What are the periods and groups in a periodic table? Give two characteristics of each.(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group. (c) Given alongside is a part of the periodic table. As we move vertically downward from Li to Fr: Li Be Na --- K --- Rb --- Cs --- Fr Ra (i) What happens to the size of atoms? (ii) What happens to their metallic character? (d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change? (e) Rewrite the following statement after correction, if necessary: Groups have elements with consecutive atomic numbers.
Can the following groups of elements be classified as Dobereiner’s triad?(a) Na, Si, Cl(b) Be, Mg, CaAtomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40 Explain by giving reason.
Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K (a) Pick two sets of elements which have similar properties.(b) The given sequence represents which law of classification of elements?
Which of the following set of elements is written in order of their increasing metallic character? Be, Mg, CaNa, Li, KMg, Al, SiC, O, N
Which of the following set of elements is written in order of their increasing metallic character?Na Li KC O NMg Al SiBe Mg Ca
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
(a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table?(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
How does the metallic character of elements change along a period of the periodic table from the left to the right and why?
(a) What is a group in the periodic table? In which part of a group would you separately expect the elements to have (i) the greatest metallic character (ii) the largest atomic size?(b) In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group. (c) From the standpoint of atomic structure, what determines which element will be the first and which the last in a period of the periodic table? (d) Explain why, the properties of elements are repeated after 2, 8, 18, and 32 elements in the periodic table. (e) What are the advantages of the periodic table?
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, Al, Si, Ba
Consider the following elements:Na, Ca, Al, K, Mg, Li (a) Which of these elements belong to the same period of the periodic table? (b) Which of these elements belong to the same group of the periodic table?

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