Chemistry
Fill in the blanks:
(a) Dalton said that …………… could not be divided.
(b) The fundamental particle of an atom carrying a negative charge is called …………… .
(c) An ion which has a positive charge is called a …………… .
(d) The outermost shell of an atom is known as …………… .
(e) The …………… of an atom is very hard and dense.
(f) Neutrons are …………… particles having mass equal to that of protons.
(g) Isotopes are the atoms of …………… element having the …………… atomic number but …………… mass number.
Atomic Structure
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Answer
(a) atoms
(b) electron
(c) cation
(d) valence shell
(e) nucleus
(f) neutral
(g) same, same, different
Answered By
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Related Questions
Assertion (A): The sum of the number of protons and neutrons present in the nucleus of an atom of an element is called its mass number.
Reason (R): The number of protons in the nucleus of an atom of an element is called its atomic number.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The circular orbits surrounding the nucleus of an atom are also called as energy levels or shells.
Reason (R): These circular orbits are associated with a fixed amount of energy.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Write True or False for the following statements:
(a) An atom on the whole has a positive charge.
(b) The maximum number of electrons in the first shell can be 8.
(c) The central part of an atom is called nucleus.
(d) The cathode rays in the discharge tube consist of protons.
(e) The neutrons are neutral and have a mass equal to 1 amu.
Match the following :
Column A Column B (a) John Dalton (i) Electronic configuration (b) J.J. Thomson (ii) Discovery of nucleus (c) Maharishi Kannada (iii) Atomic theory (d) James Chadwick (iv) Plum-pudding atomic model (e) Ernest Rutherford (v) Paramanus (j) Neil Bohr (vi) Neutrons