9. Sınıf Kimya - Atom ve Periyodik Tablo - 1

Read the following statement, if the statement is correct write T, if the statement is incorrect write F to the boxes supplied.

Dalton said that atoms could be broken into smaller pieces.

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J.J. Thomson came up with the “plum pudding” model of the atom.

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J.J. Thomson came up with a nuclear model of the atom.

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The Rutherford model of the atom had electrons moving around the nucleus in fixed shells.

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The nucleus contains protons and neutrons.

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Most of the atom is empty space.

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There are positive and negative charges in Dalton’s Atomic Model.

Read the following statement, if the statement is correct write T, if the statement is incorrect write F to the boxes supplied.

Electrons are found in the nucleus.

Which of the following is wrong about ¹²C and ¹³C atoms?

• They are isotope atoms.

• Their neutron numbers are different.

• Their electron numbers are different.

• Their nuclear charges are same.

• Their chemical properties are same.

If the ³⁹X¹⁺ and ₁₅Y^3- ions are isoelectronic, what is the neutron number of X?

• 39

• 22

• 19

• 20

• 18