Answer:
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Explanation:
because ouytermost shell contains two electrons
calcium is in group 2 so its valency is two valency is the number of outer shelll electrons it needs to have an stable outer shell . it needs 2 more .
Ethical<span> concerns </span>affect scientific research<span> when </span>scientists<span> or groups of </span>scientists<span> let their personal bias or political persuasions </span>affect<span> the </span>research<span> being conducted. </span>Scientific ethics<span> involve doing experimentation and analysis of data without bias no matter what the conclusions point to.</span>
The answer would be electronegativity
