The Atom Flashcards

1
Q

What is the mass number

A

Top number that is the sum of protons and neutrons

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2
Q

What is the atomic number

A

Number of protons and electrons

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3
Q

Why did Mendeleev reverse the order of elements?

A

So elements were in groups with similar properties

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4
Q

What is the modern name for atomic weight?

A

Relative atomic mass

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5
Q

Why did Mendeleev’s periodic table become more widely accepted than previous versions?

A

Mendeleev predicted properties of missing elements

Elements were discovered to fill the gaps

Properties matched his predictions

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6
Q

Describe what you would see when sodium reacts with chlorine

A

Flame

White solid forms

Chlorine fades away

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7
Q

Describe 3 differences between the nuclear model and plum pudding model

A

Nuclear model is mostly empty space whereas ppm is a ball of positive charge

Nuclear model electrons and nucleus are separate whereas ppm electrons embedded

Nuclear model has mass concentrated at nucleus

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8
Q

Describe the change that Bohr made to nuclear model

A

Electrons orbit the nucleus at specific distances

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9
Q

Why are most alpha particles not deflected?

A

Atom is mainly empty space

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10
Q

What are group 7 known as?

A

Halogens

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11
Q

State the two conclusions drawn from Rutherford’s alpha-scattering experiment.

A

The mass of atom concentrated at nucleus

Nucleus is positive charged

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