Chemistry
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.
Atomic Structure
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Answer
(a) False
Correct statement — An atom on the whole is electrically neutral.
(b) False
Correct statement — The maximum number of electrons in the first shell can be 2.
(c) True
(d) False
Correct statement — The cathode rays in the discharge tube consist of electrons.
(e) True
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Related Questions
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.
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.
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 Name the following :
(a) The subatomic particle with negative charge and negligible mass.
(b) Protons and neutrons present in the nucleus.
(c) The electrons present in the outermost shell.
(d) Arrangement of electrons in the shells of an atom.
(e) The number of protons present in the nucleus of an atom.
(f) The sum of the number of protons and neutrons of an atom.
(g) Atoms of same element with same atomic number but a different mass number.
(h) The smallest unit of an element which takes part in a chemical reaction.
(i) The particle which is not present in an atom of hydrogen.