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Licemer1 [7]
3 years ago
5

NEED HELP ASAP!!! ( WILL MARK BRAINLIST)

Chemistry
2 answers:
sattari [20]3 years ago
8 0
The area will experience a short-term economic boom and the area will experience a downturn once the mineral is out
kirza4 [7]3 years ago
7 0

Answer:

The first and last choice

Hope this helps! Plz mark brainliest

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How many protons, neutrons, and electrons does a magnesium atom with a mass number of 25 contain?
guapka [62]
Protons: 12
Neutrons: 13
<span>Electrons: 12</span>
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What two things do all matter have in common?
ELEN [110]

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mass and occupies space

Explanation:

matter is made up of mass and mass takes up space

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2 years ago
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Three elements are represented by the letters A, B, and C. the three elements have the same number of valence electrons. Element
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Answer:
A- beryllium
B- calcium
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Explanation
NOTE: all element in group 2 have 2 balance electrons

First let’s start with B- number of electrons= number of protons which is equal to the atomic number. therefore, the answer is calcium as it’s atomic number is 20

C- magnesium will have three energy levels considering it has 12 electrons (2,8,2).

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Is fire a source of chemical energy
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Any matter considered to be a fuel contains chemical energy

Energy has to be provided to initiate the reaction.

So yes. It is

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Which of the following represents a pair of isotopes?
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B.
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