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Bosch Method

A small,heavy...

Question

A small,heavy,positively charged mass at the centre of an atom is called __________.

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Solution

Nucleus:-
(1)An atom consists of a small heavy positively charged nucleus at its centre and the negatively charged electrons revolve around the nucleus in circular paths called orbits.
(2)All the protons and neutrons are present in the nucleus.
A small,heavy,positively charged mass at the centre of an atom is called nucleus.

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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 ____________.

What is a positively charged core in the center of the atom is called?

A very small region situated in the centre of atom, is called a/an

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

Q. An 'atom' was earlier assumed to be a sphere of radius 'a' having a positively charged point nucleus of charge +Ze at its centre.This nucleus was believed to be surrounded by a uniform density of negative charge that made the atom neutral as a whole.Use the theorem to find the electric field of this 'atom' at a distance r(r<a) from the centre of the atom

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