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OLEGan [10]
3 years ago
8

17) The elements sodium, magnesium,and silicon

Chemistry
2 answers:
irakobra [83]3 years ago
8 0

A period is a horizontal row and therefore these elements are all in the same period.

If you pull up an image of the periodic table, you will see that all of them are in the same row.

They are not isotopes of each other because an isotope is the same element with a different number of neutrons (example: carbon-12, carbon-13).

Hopefully I helped :)

Murljashka [212]3 years ago
7 0

Answer:

B) are in the same period of elements.

Explanation:

<em>The elements sodium, magnesium, and silicon </em>

<em>A) are isotopes of each other .</em> NO. Isotopes are 2 or more forms of the same element, with a different number of neutrons.

<em>B) are in the same period of elements.</em> YES.

Let's consider the electron configuration of these elements.

₁₁Na 1s² 2s² 2p⁶ 3s¹

₁₂Mg 1s² 2s² 2p⁶ 3s²

₁₄Si 1s² 2s² 2p⁶ 3s² 3p²

Since the valence electrons are in the level 3, they all belong to the third period in the periodic table.

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What volume, in milliliters, of a 0.997 M KOH solution is needed to neutralize 30.0 mL of 0.0400 M HCl?
deff fn [24]

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1.2 mL

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated:

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Molarity of base, KOH (M₆) = 0.997 M

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Volume of base, KOH (V₆) =?

MₐVₐ / M₆V₆ = nₐ/n₆

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1.2 / 0.997 × V₆ = 1

Cross multiply

0.997 × V₆ = 1.2

Divide both side by 0.997

V₆ = 1.2 / 0.997

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Thus, the volume of the base, KOH needed to neutralize the acid is 1.2 mL.

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