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Nature of Matter

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Question

From the symbol $_{2}^{4} H e$ for the element helium, write down the mass number and the atomic number of the element.

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Solution

Mass number of helium is 4 and atomic number is 2.

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Q. The atomic number of an element X is 8 and that of element Y is 12. Write down the symbols of the ions you would expect to be formed from their atoms.

Q. Write the atomic number and the symbol of an element which has mass number

32

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Q. Write the nomenclature and symbol of an element having atomic number 119?

Q. An element along with its atomic number and mass number is represented as

_{Z} X^{A}

where X is the symbol of the element, Z is the atomic number and A is the mass number. Represent elements A, B, C, D and E with its atomic number and mass number from the given data.

Elements	Number of protons	Number of electrons	Number of neutrons
A		x	y
B	a		b
C		m	m + 2
D		t	t
E	n		n + 1

Give an atomic number, atomic symbol, atomic mass of the first 20 elements.

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