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attashe74 [19]
3 years ago
12

A main group metal was studied and found to exhibit the following properties: It does not occur free in nature. It loses valence

electrons readily. It reacts readily with the halogens, oxygen, and nitrogen. It is produced by high-temperature reduction of its oxide. It reacts vigorously with water. Which of the following metals might have been the element studied?
1-Li2-Sr3-Ba4-Al5-Na
Chemistry
1 answer:
ANEK [815]3 years ago
3 0

Answer:

Barium (Ba)

Explanation:

Barium is a group 2 elements.

Valence shell electronic configuration = [Xe]6s^2

Its valence shell has only two electrons and by loosing these electrons, it attains inert gas configuration. therefore, it looses electron easily.

It is highly reactive and because of its high reactive nature, never present in nature in free state.

In general, reactivity increases down the group in the periodic table.

This is because down the group atomic size increases and electrons becomes far from the nucleus, so outer electrons are not tightly held by the nucleus. Therefore, valence shell electrons loose easily which in turn increases reactivity.

So, Ba is more reactive among all the given elements.

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I would write "terrestrial/lives on land during all life stages" between the frog and pigeon branches

Explanation:

Jaw evolution has started with fish, so i'd place that before the perch, evolution of four limbs is next and I would plate it between the perch and the frog. Evolution of an egg has ensured that organisms remain terrestrial during all stages of life and don't need to rely on water to lay their eggs. So I would place that between the frog and the pigeon. True mammary glands and true hair, as we know it formed on mammals so i'd place that between the pigeon and the rats (although synapsids evolved similar structures long before birds even existed). And lastly, I would place "walking on two legs" between rats and human branches. Because our ancestors evolved bipedalism relatively late.

6 0
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Hope this helps.

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Water and carbon dioxide are waste products released as a direct result of​
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Water and carbon dioxide are waste products released as a direct result of​ materials

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A sample of gas in which [h2s] = 3.50 m is heated to 1400 k in a sealed vessel. after chemical equilibrium has been achieved, wh
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The value of Kc for the thermal decomposition of H₂S is 2.2 x 10⁻⁴ at 1400 K:
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initial                  3.5 M               0           0
at equilibrium     3.5 M - 2x       2x          x
Kc             = [S₂][H₂]² / [H₂S]² 
2.2 X 10⁻⁴ = x(2x)² / (3.5 - 2x)²
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idfk

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cause God made it that way

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