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Atoms

The negativel...

Question

The negatively charged particles present in an atom are called ______

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Solution

The subatomic particle that has an elementary charge of magnitude -1 is known as an electron and the subatomic particle that has an elementary charge of magnitude +1 is known as a proton.
The element having the equal number of electrons and neutrons is termed electrically neutral.
Thus, The negatively charged particles present in an atom are called electrons.

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Q. Fill in the blanks.
(a) An atom consists of _______________, ____________ and _____________.
(b) _____________ are negatively charged particles, while ____________ are positively charged and ____________are ____________.
(c) The ____________ at the center of the atom has ___________ and ____________.
(d) The paths of the negatively charged particles in an atom are called ______________.
(e) Each _____________ is a unit of negative electricity.
(f) In an atom, the _____________ and ____________ are equal in number.
(g) The ___________ and ____________ together make up most of the mass of an atom.
(h) The _____________ of an ____________ is negligible.
(i) The atom as a whole is electrically ______________.
(j) An atom with a shortage or surplus of _____________ is called an ____________.

An atom that gains electrons becomes a negatively- charged ion called ______________

There is a negatively-charged core in the center of an atom called the nucleus.

State whether the following statements are true or false :

(a) Thomson proposed that the nucleus of an atom contains protons and neutrons.

(b) The cathode rays obtained from all the gases consist of negatively charged particles called electrons.

(c) The anode rays obtained from all the gases consist of positively charged particles called protons.

Q. The model of an atom according to which “An atom contains negatively charged particles called electrons embedded uniformly throughout a thinly spread positively charged spherical mass” is

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