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Atomic Number and Mass Number

An element wi...

Question

An element with atomic number 21 is a/an:

A

Halogen

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B

Representative element

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C

Transition element

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D

Alkali metal

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Solution

The correct option is C Transition element

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Q. Question 21
Which of the following elements will form an acidic oxide?

(a) An element with atomic number 7
(b) An element with atomic number 3
(c) An element with atomic number 12
(d) An element with atomic number 19

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Q. Question 43 (b)
A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.
Classify X and Y as metal (s), non-metal (s) or metalloid (s)

Q. The atomic number of an element is

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and the number of neutrons in its atom is

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. Find the mass number of the element?

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