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Science 8th Grade > Quiz 1 Study > Flashcards

Quiz 1 Study Flashcards

Study Quiz 1

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1
Q

What did Democritus Do?

A

Proposed all matter is made up of small, indivisible particles called atoms.

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2
Q

What did John Dalton do?

A

Proposed the Atomic Theory, providing a foundation for modern science.

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3
Q

What did Rutherford do?

A

Conducted the Gold Foil Experiment, discovering the dense nucleus of atoms.

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4
Q

What did Neils Bohr do?

A

He developed the planetary model of atoms with electrons orbiting the nucleus.

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5
Q

What did Schrodinger do?

A

Introduced the electron cloud model and quantum mechanics.

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6
Q

When did Democritus propose his theory?

A

5th Century B.C

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7
Q

When did Dalton propose his theory?

A

1803

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8
Q

When did Rutherford Propose his theory?

A

1911

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9
Q

When did Bohr Propose his theory?

A

1913

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10
Q

When did Schrodinger propose his theory?

A

1926

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11
Q

What are Protons?

A

Positively charged, located in the nucleus.

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12
Q

What are Neutrons?

A

Neutral particles, are located in the nucleus.

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13
Q

What are Electrons?

A

Negatively charged, orbit the nucleus in energy levels.

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14
Q

What are Valance Electrons?

A

Electrons in the outermost energy level, crucial for chemical bonding.

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15
Q

What are groups?

A

Columns that indicate the number of valance electrons

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16
Q

What are periods?

A

Rows that indicate the number of energy levels.

17
Q

What is the Periodic law?

A

Elements are arranged in order of increasing atomic number.

18
Q

What are some key properties?

A

Metals (left side of the periodic table), nonmetals (right side of the Periodic table), & noble gasses (group 8)

19
Q

What is the Atomic Number (Z)?

A

Number of protons in the Nuculus.

20
Q

What is the Atomic mass (A)?

A

The sum of protons and neutrons in the nucleus.

21
Q

What are Isotopes?

A

Variants of elements differing in the neutron count.

22
Q

What is the Law of Periodicity?

A

Elements are arranged in order of increasing atomic number.

Science 8th Grade (1 decks)

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