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3 years ago

1. How is the number of energy levels in an atom related to the period number?

Chemistry

1 answer:

Natalka [10]3 years ago

4 0

Answer:

The highest energy level number (1 through 7) for the electrons in an atom corresponds to the period (or row) in the periodic table to which that atom belongs. Because there are 7 periods in the table, there are 7 energy levels. For example, hydrogen (H) is in the first period, so it has only one energy level.

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Using the picture below, once air mass A reaches location B, the weather conditions at location B will most likely become

olga2289 [7]

I think the answer is a

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3 years ago

) In order to plate a steel part having a surface area of 200 in.2 with a 0.002 in.-thick layer of nickel: (a) how many atoms of

Fiesta28 [93]

Answer:

(a). 5.4 × 10^23 atoms.

(b). 0.8928 moles Ni.

Explanation:

The first thing to do is to convert surface area from the in^2 to cm^2 and also the thickness unit to cm.

Therefore, 200 in^2 = 1290.3 cm^2 and 0.002 in = 0.00508 cm.

The next thing to do is to calculate the volume by using the formula below;

Volume= A × d. Where A = area and d = thickness.

Then, volume = 1290.3 × 0.00508= 6.55 cm^3.

Although not given but the Density if Nickel = 8 g/cm^3.

We know that the formula for Calculating density = mass / volume. So, we have ; mass = density × volume.

Mass= 8 × 6.55 = 52.4 g.

(a). The number of atoms of Nickel= moles × Avogrado's number.

Numbers of moles= mass / molar mass.

==> 52.4 / 58.6934 = 0.8928 moles.

Then, the number of atoms of Nickel = 0.8928 × 6.02 × 10^23.

= 5.4 × 10^23 atoms.

(b). The number of moles of Nickel has been Calculated in (a) above to be = 0.8928 moles Ni.

5 0

4 years ago

Read 2 more answers

High self-monitors prefer situations in which clear expectations exist regarding how they're supposed to communicate. True False

xeze [42]

Answer:

True

Explanation:

This are acts or actions that concur with situational expectations.

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3 years ago

Lily replicates an experiment that found that the number of calories in a particular food is 50 kcal. She obtained data from

Tresset [83]

Answer:

invalid

Explanation:

Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid

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4 years ago

Name the element described in each of the following:

borishaifa [10]

Alkaline earth metal whose cation isoelectric with Kr is strontium (Sr).

What is Alkaline earth metal?

Six chemical elements from group 2 of the periodic chart make up the alkaline earth metals. They are boron (R), barium (Ba), calcium (Ca), strontium (Sr), magnesium (Mg), beryllium (Be), and radium (Ra). The elements share many characteristics, including being glossy, silvery-white, moderately reactive metals at standard pressure and temperature.

They share a full outer s-orbital structurally, meaning that this orbital includes all two of its electrons, which the alkaline earth metals rapidly lose to form cations with a charge of +2 and an oxidation state of +2.

All of the identified alkaline earth metals are found in nature, albeit radium is not a primordial element but only appears as part of the decay chain of uranium and thorium.

The chemical element strontium has the atomic number 38 and the symbol Sr. Strontium is a soft, silver-white, yellowish metallic element that is an alkaline earth metal and has a strong reactivity to chemicals. When the metal is exposed to air, a thick layer of dark oxide forms. Similar to its two vertical neighbors in the periodic table, barium and calcium, strontium exhibits physical and chemical characteristics. It is mostly obtained from the minerals celestine and strontianite, where it is found naturally.

To learn more about Strontium click on the link below:

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8 0

2 years ago