Write true or false for each statement. Rewrite the false statements correctly: Gamma rays have no charge and mass.

This statement is true, as a gamma ray is a packet of electromagnetic radiation called a photon. Gamma rays are caused by changes within the nucleus. They have no mass and no charge, its symbolic representation is- γ 0 0 . Gamma rays are similar to X - rays and radio waves. Gamma rays are produced during the disintegration of radioactive atomic nuclei and the decay of certain subatomic particles.

Complete the following table: Particle Mass number Atomic number Protons Neutrons Electrons Al 27 - - - 13 O - 8 - 8 - Cl - 35 - 17 - - Na + 23 11 K 39 19 - - - - - N a + 1 11 23 - - - - - Al 3 + 13 27 - - - - - Mg 2 + 12 24 - - - - - S 16 32 2 - - - - - - Cl - 17 35 - - - - -

Particle Mass number Atomic number Protons Neutrons Electrons Al 27 13 13 14 13 O 16 8 8 8 8 Cl - 35 17 17 18 18 Na + 23 11 11 12 10 K 39 19 39 19 19 20 19 N a + 1 11 23 23 11 11 12 10 Al 3 + 13 27 27 13 13 14 10 Mg 2 + 12 24 24 12 12 12 10 S 16 32 2 - 32 16 16 16 18 Cl - 17 35 35 17 17 18 18

E M B I B E

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q C

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8th ICSE

IMPORTANT

Earn 100

Write true or false for each statement. Rewrite the false statements correctly:

The atomic number is the number of protons and electrons.

Important Questions on Atomic Structure

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8th ICSE

IMPORTANT

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q C

Write true or false for each statement. Rewrite the false statements correctly:

Alpha particles carry two units of positive charge and four units of mass.

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8th ICSE

IMPORTANT

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q C

Write true or false for each statement. Rewrite the false statements correctly:

Gamma rays have no charge and mass.

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8th ICSE

IMPORTANT

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q C

Write true or false for each statement. Rewrite the false statements correctly: The number of protons and neutrons in an atom is called the mass number.

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8th ICSE

IMPORTANT

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q C

Write true or false for each statement. Rewrite the false statements correctly:

Protons have $1.602 \times 10^{- 19} C$ of positive units.

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8th ICSE

IMPORTANT

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q C

Write true or false for each statement. Rewrite the false statements correctly: Neutrons are negatively charged particles.

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8th ICSE

IMPORTANT

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q C

Write true or false for each statement. Rewrite the false statements correctly: Neutrons were discovered by Chadwick.

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8th ICSE

IMPORTANT

New Trends in Chemistry Class 8>Chapter 4 - Atomic Structure>Objective Questions>Q D

Complete the following table:

Particle	Mass number	Atomic number	Protons	Neutrons	Electrons
$Al$	$27$	-	-	-	13
$O$	-	$8$	-	$8$	-
${Cl}^{-}$	$35$	-	$17$	-	-
${Na}^{+}$	$23$		$11$
${}_{19}K^{39}$	-	-	-	-	-
${}_{11}^{23}{N a}^{+ 1}$	-	-	-	-	-
${}_{13}^{27}{Al}^{3 +}$	-	-	-	-	-
${}_{12}^{24}{Mg}^{2 +}$	-	-	-	-	-
${{}_{16}^{32}S}^{2 -}$	-	-	-	-	-
${}_{17}^{35}{Cl}^{-}$	-	-	-	-	-