Question

1. Answer the following.
What is the relationship between the
c. What is
meant by atomic
atomic mass
number ? Explain how the atomic
number and mass number of carbon are
6 and 12 respectively.
d. What
is meant
subatomic
particle ? Give brief information of three
subatomic particles with reference to
electrical charge, mass and location.
by
a. What is the difference in the atomic
models of Thomson and Rutherford?
b. What is meant by valency of an element?
number of valence electron and valency?​

Answer 1

Explanation:

1)Atomic number of an element refers to the number of electrons or protons present in that element. ... Carbon has 6 protons, 6 electrons and 6 neutrons. So the atomic number is 6 as the number of protons is 6. The mass number is 12 as the sum of protons and neutrons is 12.

2)Protons are positively-charged particles. Neutrons are neutral particles. Surrounding the nucleus is a cloud of very small subatomic particles called electrons. Electrons are negatively-charged particles.

3).J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. ... Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.

4)The valency of an element is either equal to the number of valence electrons in its atom or equal to the number of electrons required to complete eight electrons in the valence shell.

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