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grade 9 science > Periodic Table > Flashcards

Periodic Table Flashcards

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0
Q

What nickname was given to the model of the atom proposed by john dalton?

A

Billiard ball model

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1
Q

Which scientists model was the first to introduce the idea of electrons

A

Thomson

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2
Q

The solar system model of the atom was developed by…?

A

Thomson

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3
Q

The idea that an atom has a dense positive nucleus was proposed by..?

A

Rutherford

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4
Q

According to the current model of the atom electrons exits where?

A

In orbitals

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5
Q

The atomic mass of an element indicates the?

A

Sum of protons plus neutrons

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6
Q

The atomic number of magnesium is 12. It nucleus most contain?

a. 6 protons and 6 neutrons
b. 12 protons and no electrons
c. 6 neutrons and no neutrons

A

b. 12 protons and no electrons

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7
Q

The elements in the periodic table are arranged by?

A

Atomic number

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8
Q

Horizontal rows of elements in the periodic table are called?

A

Periods

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9
Q

Vertical columns of elements in the periodic table are called?

A

Groups

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10
Q

Isotopes of the same element may differ in their number of?

A

Neutrons

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11
Q

An ion of a certain atom has a different number of..?

A

Electrons then usual

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12
Q

The periodic table was designed by who?

A

Mendeleev

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13
Q

Properties of metals

A

Shiny

Good conductors

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14
Q

Metalloids are located where on the periodic table?

A

On the right after the metals

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15
Q

Examples of physical changes

A

Melting, boiling, freezing,

16
Q

Examples of chemical changes

A

Water evaporating

17
Q

Indicators of a chemical change?

A

Changes the kinds of molecules present

Difficult to reverse

18
Q

An element has more electrons than protons. True or false?

A

False! An element has the same amount of electrons and protons

19
Q

Isotopes of the same element have different atomic numbers. True or false

A

False! isotopes of the same element have a different amount of electrons

20
Q

Atomic symbols are the same in each country and language. True or false

A

True!!!

21
Q

There are four elements! Fire, earth, water, air. True or false

A

False

22
Q

All elements have been found. True or false?

A

False there are still many unfound elements

23
Q

A proton is heavier than an electron. True or false?

A

True a proton is much heavier

24
Q

A group of atoms with the same amount of protons but different amount of neutrons is called?

A

An isotope

25
Q

An atom with a different number of electrons is called?

A

An ion

26
Q

If there are extra electrons it will be….

a. Negative
b. positive

A

a. Negative

27
Q

If there are missing electrons it will be? a. Negative

b. Positive

A

b. positive

grade 9 science (4 decks)

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