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Chemistry > Atoms > Flashcards

Atoms Flashcards

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1
Q

What are atoms represented as?

A

Chemical symbols eg Mg magnesium

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2
Q

how do you tell the period from the atomic structure

A

How many electrons in the outer shell

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3
Q

How can you tell an elements period from the structure

A

How many shells there are

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4
Q

What is the relative atomic mass? Calculation

A

Mass x percentage

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5
Q

What is a relative atomic mass? Definition

A

The average value of the isotopes in an element

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6
Q

What is an element called if there are more neutrons than protons and electrons

A

Isotope

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7
Q

More protons =

A

Positive isotope

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8
Q

What is a noble gas

A

In group 8 and is unreactive because all its shells are full

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9
Q

Group 7 name

A

Halogens

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10
Q

Group 8 is called

A

The noble gasses

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11
Q

Group 1 is called

A

Alkaline metals

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12
Q

What is the middle section on the periodic table called

A

The transition metals

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13
Q

What is a protons relative charge

A

+1

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14
Q

What is a neutrons relative charge

A

0

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15
Q

What is an electrons relative charge

A

-1

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16
Q

Who discovered electrons

A

J.j Thomson

17
Q

Who discovered protons

A

Ernest Rutherford

18
Q

Who discovered neutrons

A

Chadwick

19
Q

Before protons were discovered how was the PT arranged

A

In order of atomic weights

20
Q

Describe the ‘plum pudding’

A

Atom is a ball of positive charges with negative electrons in it

21
Q

What was Mendeleevs progress of the PT

A

He left gaps for elements he predicted would exist in the future and was eventually proved right

22
Q

How many elements r in the PT

A

118

23
Q

Before electrons were discovered what was an atom

A

Tiny spheres that couldn’t be divided

24
Q

What side of the periodic table r metals on

A

Left

25
Q

What side of the periodic table r non metals on

A

Right

26
Q

Properties of metals

A

Shiny, malleable, ductile, dense, high melting + boiling point, conductors,

27
Q

What is in the nucleus of an atom

A

Protons + neutrons

28
Q

Sum of protons and neutrons = ??

A

The mass number

Chemistry (6 decks)

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