Atomic structure Flashcards

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1
Q

How published his idea about atoms?

A

John Dalton published his idea about atoms.

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2
Q

What year did john Dalton share his idea about atoms?

A

In 1803

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3
Q

What did John Dalton think about atom?

A

He thought that all matter was made by atom.

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4
Q

When did Electrons got discovered?

A

Electrons got discovered nearly 100 year later.

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5
Q

Who discovered Electrons?

A

J J Thomas discovered electrons.

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6
Q

What is plum pudding model?

A

An early model of the atom in which an atom is a ball of positive charge with Negative electrons embedded.

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7
Q

Who designed an experiment to test plum pudding model?

A

Ernest Ruther ford designed an experiment from plum pudding model.

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8
Q

When Ernest Ruther ford test them?

A

Hi test in 1909.

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9
Q

What did Ernest Ruther ford find in experiment

A

In the experiment hi find out there is an positively charged alpha particle were find in the gold fiol.

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10
Q

What is Alpha particle?

A

Subatomic particle comprising two protons and two neutrons.

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11
Q

What did new atom called?

A

It called a nuclear model.

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12
Q

What is inside of nuclear?

A

The mass of an atom is concentrated at the centre of atom there is Nucleus, that contain protons and neutrons.

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13
Q

What charge does protons have?

A

Protons have positive charge.

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14
Q

What charge does neutron have?

A

Neutrons have no charge they are neutrol.

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15
Q

What charge does electrons have?

A

Electrons have negative charge.

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16
Q

What is atomic number?

A

The tell us how many number of protons in the nucleus of an atom. Also called the protons number.

17
Q

What is Mass number?

A

The mass number of an atom is its total number of protons and neutrons.

18
Q

What is subatomic particle?

A

Objects found in atoms, including protons, neutrons and electrons.

19
Q

How to calculate the number of subatomic particles?

A

To calculate the number of subatomic number in an atom, use its atomic number and the mass:
1.Number of protons = atomic number
2.Number of electrons = atomic number
3.Number of neutrons = mass number - atomic number.

20
Q

What is isotopes?

A

Atoms of the same elements with different numbers of neutrons are called isotopes.

21
Q

What does isotopes has?

A

Isotopes of an elements have:
1.The same atomic number.
2.Different mass numbers.

22
Q

What is relative atomic mass?

A

The mean relative mass of the atoms of the atoms of the different isotopes in an elements.

23
Q

Who to calculate relative atomic mass?

A

The relative atomic mass, Ar, of an elements is calculated from:
1.The mass numbers of its isotopes.
2.The abundance of these isotopes.

24
Q

What is abundance?

A

If there is a lot of something, it is described as being abundant.

25
Q

What formula to find relative atomic mass?

A

Ar total mass of atoms/totals number of atoms.