Why is helium considered as a noble gas

2 answers:

7 0

Noble gases are known for having a full outer shell of electrons which helium has as it has two electrons its first electron shell is completely filled

larisa [96]3 years ago

3 0

Helium is considered a noble gas because it has 8 valence electrons, as well as it also is a stable element. Meaning that it consists of a full octet.

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So its not A so its B C or D plz help

Rainbow [258]

Answer:

the answer is B

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3 0

3 years ago

In the equation shown, what are the reactant(s)?

Vladimir [108]

C3H8 + O2 (please give me brainliest$

4 0

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A group of students is investigating whether aluminum is a better thermal conductor than steel. The students take an aluminum wi

Mademuasel [1]

The students have conducted an experiment to check their hypothesis on the thermal conductivity of two metals; Aluminum and steel. The experimental observations have been noted, and the next step based on the scientific procedure is to analyze the data.

Analysis of data suggests that; since the length of wax after 10 min is lower in Al than steel, aluminum is a better thermal conductor.

Ans B) Analyze the data

7 0

3 years ago

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How is an exothermic reaction identified on a potential energy diagram?

Alla [95]

Energy diagrams are use to depict the energy changes that occur during a chemical reaction. There are two types of reaction based on the energy change, these are exothermic and endothermic reactions. In endothermic reactions energy are gained while in exothermic reactions energy are lost to the environment. To identify an exothermic reaction on a potential energy diagram, one has to compare the potential energy of the reactants and the products. If the potential energy of the product is less than that of the reactants, the reaction is exothermic.

4 0

3 years ago

if the spin of one electron in an orbital is clockwise , what is the spin of the other electron in that orbital

nata0808 [166]

Here we have to get the spin of the other electron present in a orbital which already have an electron which has clockwise spin.

The electron will have anti-clockwise notation.

We know from the Pauli exclusion principle, no two electrons in an atom can have all the four quantum numbers i.e. principal quantum number (n), azimuthal quantum number (l), magnetic quantum number (m) and spin quantum number (s) same. The importance of the principle also restrict the possible number of electrons may be present in a particular orbital.

Let assume for an 1s orbital the possible values of four quantum numbers are n = 1, l = 0, m = 0 and s = $\frac{+}{-}$ $\frac{1}{2}$ .

The exclusion principle at once tells us that there may be only two unique sets of these quantum numbers:

1, 0, 0, + $\frac{1}{2}$ and 1, 0, 0, - $\frac{1}{2}$ .

Thus if one electron in an orbital has clockwise spin the other electron will must be have anti-clockwise spin.

6 0

3 years ago