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Standard VIII

Chemistry

Dalton's Atomic Theory

Write 'true' ...

Question

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.

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Solution

(a) An atom on the whole has a positive charge.
false
(b) The maximum number of electrons in the first shell can be 8.false
(c) The central pad of the atom is called nucleus.
True.

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Similar questions

Fill in the blanks in the following statements :

(a) The number of protons in the nucleus of an atom is called its ....................

(b) The total number of protons and neutrons in the nucleus of an atom is called its ....................

(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ....................

(e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ....................

(f) Almost all the mass of an atom is concentrated in a small region of space called the ....................

(g) Cathode rays are a beam of fast moving ....................

(h) The anode rays obtained from hydrogen gas consist of particles called ....................

(i) The maximum number of electrons that can be accommodated in L shell are ....................

(j) The maximum number of electrons that can go into the M shell is ....................

(k) The subatomic particle not present in a hydrogen atom is ....................

(l) The electron has .................... charge, the proton has .................... charge, and the neutron has .................... charge.

State whether the following statements are True or False. Correct the false statement:

(a) An atom as a whole is electrically neutral.

(b) Mass of atom is distributed evenly within it.

(d) The K shell has maximum energy.

(e) Isotopes have same atomic number but different atomic mass number.

Q. Write T for the true statement and F for the false one. Correct the false statement(s).
1. Mars is the largest planet in the solar system.
2. Richard scale is used to measure the magnitude of an earthquake.
3. The positively charged particles in an atom are called protons.
4. Ions are atoms or group of atoms with a positive or a negative charge.
5. The number of oscillation per second is called the frequency of oscillations.

State whether the following statements are true or false :
(a) A sodium ion has positive charge because it has more protons than a neutral atom.
(b) A chloride ion has negative charge because it has more electrons than a neutral atom.

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

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Dalton's Atomic Theory

Standard VIII Chemistry

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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.

(a) An atom on the whole has a positive charge. false (b) The maximum number of electrons in the first shell can be 8.false (c) The central pad of the atom is called nucleus. 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.

(a) An atom on the whole has a positive charge.
false
(b) The maximum number of electrons in the first shell can be 8.false
(c) The central pad of the atom is called nucleus.
True.