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Rutherford's Experiment and Observations

The of an ato...

Question

The ____ of an atom is dense, small in size, and positively charged.

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Solution

Nucleus:
The center portion of the atom is known as the nucleus.
The nucleus contains protons (positively charged) and neutrons (electrically neutral)
Thus, the nucleus becomes positively charged.
As the protons and neutrons are closely packed in the nucleus, it is dense and small in size.
Hence, the nucleus of an atom is dense, small in size, and positively charged.

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Fill in the blanks :

(a) Dalton said that _______________ could not be divided.

(b) An ion which has a positive charge is called a _______________

(c) The outermost shell of an atom is known as _______________

(d) The _______________ of an atom is very hard and dense.

(e) Neutrons are __________________ particles having mass equal to that of portons.

(f) Isotopes are the atoms of __________________element having the __________________atomic number but __________________mass number.

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 ____________.

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

Q. Following conclusions were drawn from the given figure :
I. There is a positively charged centre in an atom called the nucleus.
II. An atom consists of a positively charged sphere and the electrons are embedded in it.
III. The electrons revolve around the nucleus in well-defined orbits.
IV. The size of the nucleus is very small as compared to the size of the atom
V. Only certain special orbits known as discrete of electrons are allowed inside the atom.
Choose the correct statements.

According to J.J Thomson, an atom is a positively charged sphere. Which sub-atomic particles is embedded in it?

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