Explain with examples 1) Atomic number 2) Mass number 3) Isotopes 4) Isobars. Give any two uses of isotopes
Answers
the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
2) Mass no
the total number of protons and neutrons in a nucleus
3) isotopes
. Isotopes are atoms of the same element having the same numbers of protons, but different numbers of neutrons.
4) isobar
a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
Answer:
Explanation:
i) Atomic Number is the total number of protons present in the nucleus of an atom. It is also equal to the number of electrons for a neutral atom. Example, atomic number of sodium is 11.
ii) Mass Number is the number of protons and neutrons in the nucleus taken together. For example, mass number of sodium is 23 g/mol.
iii) Isotopes are elements with the same atomic number but different mass numbers. Example, hydrogen has 3 isotopes - protium (1H1), deuterium (2H1) and tritium (3H1).
iv) Isobars are elements which have different atomic numbers but the same mass number. They are different chemical elements. Example, iron and nickel, both have mass number 58, whereas atomic numbers are different.
Uses of isotopes -
a) Some isotopes are used in the process of labelling for various studies. Like, isotopes of hydrogen, carbon, nitrogen etc. are used for labelling process.
b) Used for nuclear imaging of various tissues for detection of diseases. fluorine-18, gallium-67 etc. are used for this purpose.
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