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The Fundamental Unit Of Life

Question

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Comment:All substances contain protons in addition to electrons.

Solution

There are numerous experiments to show that protons are present along with electrons in all substances. Protons are emitted during radioactive decay of various radioactive substances. Nitrogen present in the upper layer of atmosphere is converted into radioactive carbon by emission of a proton when the cosmic rays coming from the sun fall on it.
$straight N presubscript 7 presuperscript 14 space plus space stack straight n presubscript 0 presuperscript 1 space with n e u t r o n below space space rightwards arrow space space space space straight C presubscript 6 presuperscript 14 space plus space space stack straight P presubscript 1 presuperscript 1 with P r o t o n below$
It is thus concluded that protons like electrons are the constituent particles of all matter.

Some More Questions From The Fundamental Unit of Life Chapter

Define valency by taking examples of silicon and oxygen.

Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.

Na⁺ has completely filled K and L-shells. Explain.

If Z = 3, what would be the valency of the element? Also, name the element.

Composition of the nuclei of two atomic species X and Y are given as under

X Y
Protons = 6 6
Neutrons= 6 6

Give the mass numbers of X and Y. What is the relation between the two species?

For the following statements, write T for True and F for False.

(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

(b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

(c) The mass of an electron is about 1/2000 times that of proton.

(d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.

Rutherford’s α-particle scattering experiment was responsible for the discovery of

Isotope of an element has

Number of valence electrons in Cl^- ion are

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