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Anni [7]
3 years ago
14

How are the periods, or horizontal rows, on a periodic table ordered from left to right? (2 points)

Chemistry
2 answers:
Nesterboy [21]3 years ago
8 0
The answer is the second one .......................
Anarel [89]3 years ago
6 0
#2
They are ordered by increasing number of protons (aka atomic number)
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Hydrogen is unique among the elements because ________. 1. It is not really a member of any particular group. 2. Its electron is
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Answer:

1,2,5

Explanation:

Hydrogen can't really be classified into any group in the periodic table because it doesn't have properties that match that of any group exactly. However it exhibits a property of group 1A (formation of a univalent positive ion) and that of group 7A (formation if a univalent negative ion). It contains only one electron, hence this outermost electron is not shielded at all from the nucleus.

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3 years ago
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Explanation:

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2 years ago
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How many protons does hydrogen have?
Nataly_w [17]

Hello there!

Hydrogen has one proton because the number of protons in an atom is equal to the atomic number of the element. S ince hydrogen's atomic number is 1, it has one proton.

I hope that's help !

4 0
3 years ago
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