Calcium is a chemical element that has an atomic number of 20. The atomic number of element just means how many protons are in the core of the particular element.
A picture of the element of calcium is attached with its atomic number.
How do you figure out how many valence electrons an element has?
2 answers:
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Given parameters:
Density = 2.7g/cm³
Length of the cube = 10cm
Unknown:
Mass of the cube = ?
Solution:
Density is the mass per unit volume of a substance.
Density =
Mass = density x volume
We need to find the volume of the cube;
Volume of the cube = L³
where L is the length of the cube;
Volume of the cube = 3³ = 27cm³
So, the mass of the granite = 2.7 x 27 = 72.9g
The granite has a mass of 72.9g