Hello!
The correct answer is 1. KCI.
I really hope this helped you out! c:
Answer: X3+
Explanation:
Every atom aim to achieve stability by receiving electrons or giving their valence electrons in order to have a complete outermost shell of 2 (duplet) or 8 (octet structure).
In this case, the atom X will easily give off its three valence electrons to another atom(s), thereby forming a trivalent positive ion (X3+) with a stable duplet or octet structure (i.e an outermost shell with 2 or 8 electrons).
X --> X3+ + 3e-
Thus, due to the give away of three electrons (3e-), the atom X becomes X3+.
An ionic equation contains two ions in the full equation
Answer:
kilogram
Explanation:
because kilogram is equal to thousand grams
A
It is referred to as the Great Oxygenation Event. During this time, photosynthetic organisms evolved and begun utilizing sunlight for energy. They captured this energy into chemical energy. These organisms took up carbon dioxide and evolved oxygen into the atmosphere.
Explanation:
Oxygen levels in the atmosphere rose drastically as those of carbon dioxide and methane dropped. This increase of oxygen in the atmosphere also allowed the formation of an ozone layer that protects genetic material from UV light. This largely enabled organisms to conquer land.
Learn More:
For more on the Great Oxygenation Event check out;
brainly.com/question/11255683
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