Answer:
d is the answer
Explanation:
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I pretty sure it is Gas. Hope this is what you're looking for. Have a great day! :D
The answer should be A, the number of electrons increases by 1, from left to right.
Across the periods (horizontal direction) in periodic table, each element has one more electron then the one before it. The number of period determines the number of occupied electron shells of the elements in that period. Which means, period 1 elements have 1 occupied electron shell, period 2 has 2, period 3 has 3 etc.
Therefore, the answer is A, we always go from left to right, and plus since period 2 elements only have 2 occupied electrons so their 2nd electron shell electrons must increase throughout the period.
A scientist form a hypothesis because he wants to : (D). To provide a statement that can be tested with an experiment
<h3>Meaning of hypothesis</h3>
A hypothesis can be defined as a statement that is proposed by a scientist and needs to be tested by other scientist.
So in a simple statement, hypothesis in its raw state is an untested and unproven fact that is propagated by a scientist.
In conclusion, a scientist form a hypothesis because he wants to : To provide a statement that can be tested with an experiment
Learn more about hypothesis: brainly.com/question/11555274
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Tetrahedral is the answer