2.2/2.3 Elements, groups and organizing Flashcards

1
Q

Atomic mass

A

the weight of a single atom

measured in atomic mass units AMU

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2
Q

each atom is made up of

A

proteins, neutrons, electrons

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3
Q

In each box on the periodic table elements are arranged horizontally by —–

A

atomic number

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4
Q

Atomic Number

A

is the number of proteins (and electrons) in the atoms nucleus

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5
Q

Atomic number facts

A

the number of protiens in an atom is like the fingerprint of the atom, if you change the number of protons you change the element.

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6
Q

Alkaline Metals (group one)

A
  1. Most reactive of the metals 2. React when exposed to air or water 3. As you move down the group reactivity increases
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7
Q

Alkaline Earth Metals

A

They react when exposed to water or air but not as strong as the Alkaline metals

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8
Q

Halogens (17)

A
  1. various colours and physical states 2. Most reactive of the non metals 3. Can combine with other metals to form new substances
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9
Q

Noble gases (18)

A
  1. Most stable and unreactive elements 2. Long thought that they could not combine with other elements.
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