It's simple.
the number of protons in an atom never changes. And also, the no of protons is its atomic number.if you look up the periodic table, you will find a number on the top - left corner of each of the boxes. This is the atomic number.No 2 same elements on the periodic table have the same atomic number. So, all you have to do is search for a box that has the number 13 on it.

and by the way ... the element which you're searching for is Aluminium

7 0

3 years ago

What are the useful of carbon dioxide?

mamaluj [8]

Answer:

It is used as a refrigerant.

It is used for fire extinguisher

7 0

2 years ago

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The Ksp of calcium sulfate, CaSO4, is 9.0 × 10-6. What is the concentration of CaSO4 in a saturated solution? A. 3.0 × 10-3 Mola

Svet_ta [14]

Answer: The concentration of $CaSO_4$ in a saturated solution is $3.0\times 10^{-3}M$

Explanation:

Solubility product is defined as the equilibrium constant in which a solid ionic compound is dissolved to produce its ions in solution. It is represented as $K_{sp}$

The equation for the ionization of $CaSO_4$ is given as:

$K_{sp}$ of $CaSO_4$ = $9.0\times 10^{-6}$

By stoichiometry of the reaction:

1 mole of $CaSO_4$ gives 1 mole of $Ca^{2+}$ and 1 mole of $SO_4^{2-}$

When the solubility of $CaSO_4$ is S moles/liter, then the solubility of $Ca^{2+}$ will be S moles\liter and solubility of $SO_4^{2-}$ will be S moles/liter.

$K_{sp}=[Ca^{2+}][SO_4^{2-}]$

$9.0\times 10^{-6}=[s][s]$

$9.0\times 10^{-6}=s^2$

$s=3.0\times 10^{-3}M$

Thus concentration of $CaSO_4$ in a saturated solution is $3.0\times 10^{-3}M$

7 0

2 years ago