1.The repeating pattern of the properties of elements from row to row in the periodic table is an example of ___________

1 answer:

6 0

1. P<span>eriodicity (the repetition of several properties in a row on the Periodic Table)

2. Noble Gas (Noble gases are located in group 18 on the Periodic Table)</span>

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What is an absorption spectrum?

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Answer: option A. the colors absorbed when an element gains energy.

Justification:

The electromagnetic waves, visible light included, consists of a gamma of waves with different frequencies and wavelengths.

The visible light can be decomposed in a set of series of lines of light with different frequencies and that decomposition is what a spectrum of light is. Each series correspond to a color.

The atoms can absorb and emit photons. That is, atoms can absorb and release energy.

When the atom abosorbs a photon an electron gets excited ( the electron gains energy).

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Sodium hydrogen carbonate has:
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Not to be confused with Sodium Carbonate, (Na2CO3), which lack an H, Sodium Hydrogen Carbonate is sometimes shortened to just Sodium Bicarbonate. It is used in the kitchen (cooking) as "baking soda."

Formula: NaHCO3

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A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across a distance.

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Answer: it consists of two simple machines: a lever and a wheel and axle. Effort is applied to the lever by picking up the handles of the wheelbarrow.

Explanation:

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