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प्रश्न
Give the symbols of: Carbon, calcium, copper, chlorine, cobalt, argon.
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उत्तर
Carbon is C, Chlorine is Cl, Calcium is Ca, Cobalt is Co Copper is Cu, Argon is Ar.
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संबंधित प्रश्न
Fill in the blank
Use of a ................. to separate the components of a mixture of solids is based on the difference in the size of the components
Tick the most appropriate answer.
The constituents of a mixture are present in
- a fixed ratio
- a variable ratio,
- the ratio of 2: 1
- none of these
Give reason: Argon is filled in electric bulbs.
Fill in the blank
_________ refers to the number of atoms in the molecule of an element
Tick (√) the correct alternative from the choice given for the following statement.
The most abundant elements in the universe are
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
Select the correct answer from the choice given below.
The element which is malleable
Write the names of elements from the following symbol:
Pt
‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.
