Periodic Classification of Elements
SCIENCE & TECHNOLOGY PART 1
CHAPTER NO. 2
Column I
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Column 2
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Column 3
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i. Triad
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a. Lightest and negatively charged particle in all the atoms.
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1. Mendeleev
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ii. Octave
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b. Concentrated mass and positive charge.
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2. Thomson
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iii. Atomic Number
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c. Average of the first and the third atomic mass
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3. Newlands.
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iv. Period
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d. Properties of the eight element similar to the first.
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4. Rutherford.
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v. Nucleus
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e. Positive charge on the nucleus.
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5. Dobereiner
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vi. Electron
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f. Sequential change in molecular formulae
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6. Moseley
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Ans. (i – c – 5 ) , (ii – d – 3) , (iii – e – 6 ) , (iv – f – 1) , (v – b – 4), (vi - a – 2).
a. The number of electrons in the outermost shell of alkali metals is ……………………..
i. 1
ii. 2
iii. 3
Iv. 7
b. Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ………………
i. Group 2
ii. Group 16
iii. Period 2
iv. d – block.
c. Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Which of the following elements be present in the same group as X.
i. Na
ii. Mg
iii. Al
Iv. Si
d. In which block of the modern periodic table are the nonmetals found?
i. s - block
ii. p - block
iii. d - block
iv. f – block.
6. Write short notes:
7. Write Scientific reasons.
Project:
Find out the applications of all the inert gases, prepare a chart and display it in the class.
Important Extra Questions, on this chapter that may come in your Board Exam.
GIVE SCIENTIFIC REASONS
ANSWER THE FOLLOWING
