Answer:
Calcium is a metal.
Explanation:
It is considered a metal because it is most likely to give away it's two valence electrons to reach Argon. All the elements in gray are metals.
Answer : There are 7.0 moles of oxygen in the formula.
Explanation :
The chemical formula of nickel tetracarbonyl is Ni(CO)₄.
We can see that there are 4 carbon atoms and 4 oxygen atoms which together form 4 carbonyl (CO) groups.
Therefore the mole ratio of C to O is 1 : 1.
Let us use this as a conversion factor to find moles of oxygen.
We have 7.0 moles of carbon in the formula.
The moles of O can be calculated as,

There are 7.0 moles of oxygen in the formula.
As you move from left to right of the periodic table, the element becomes more negative.
Answer:
certain types of plants (vascular plants) have a system for transporting water, minerals
A coordination number can be determined by the usage of an atom towards a molecule from seeing how many numbers of atoms would have to be combined together in an atom.