It cropped out “D” but D is Calcium please help asap !!!

Chemistry

1 answer:

notka56 [123]4 years ago

3 0

Answer:

Option A. Potassium.

Explanation:

The electronic configuration of the element given above is:

1s2 2s2 2p6 3s2 3p6 4s1

To know which element has the above electronic configuration, we simply calculate the atomic number of the element. This can be obtained by adding the electrons in the electronic configuration as follow:

2 + 2 + 6 + 2 + 6 + 1 = 19

The atomic number of the element is 19.

Atomic number is the identity of elements in the periodic table. No two elements have the same atomic number.

Therefore, the element is Potassium because only potassium has atomic number of 19 in the periodic table.

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Read 2 more answers

Arrange these molecules in order of decreasing mass: C6H14 , NO2 , Fe2O3 , and CaCO

babunello [35]

The following is the arrangement of the given molecules in decreasing order of mass: $\text{ Fe2O3} > \text{C6H14} > \text{CaCO} > \text{NO2}$

Solution:

First inorder to arrange the elements in descending order of their mass we have to calculate the molecular mass of each element. The calculation is as follows:

Mass of C6H14:

$C\rightarrow6\times12.01 = 72.06$