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astraxan [27]
1 year ago
13

Which elements on the periodic table are not reactive? Why?

Chemistry
2 answers:
iVinArrow [24]1 year ago
5 0

Answer:

Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level.

Inessa [10]1 year ago
3 0

Answer:

Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. They have eight valence electrons, which fill their outer energy level.

Explanation:

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One<br> 63 Cu atom has a mass of 1.045 x 10-22 g. Calculate the mass of 3.0 moles of 63Cu atoms
12345 [234]

The mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

<h3>Stoichiometry</h3>

From the question, we are to calculate the mass of 3.0 moles of ⁶³Cu atoms.

From the given information,

One ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

First, we will determine the number of atoms present in 3.0 moles of ⁶³Cu atoms

Using the formula,

Number of atoms = Number of moles × Avogadro's constant

Number of ⁶³Cu atoms present = 3.0 × 6.022 × 10²³

Number of ⁶³Cu atoms present = 18.066 × 10²³ atoms

Now, we will determine the mass  of 18.066 × 10²³ ⁶³Cu atoms

If 1 ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

Then,

18.066 × 10²³ ⁶³Cu atoms will have a mass of 18.066 × 10²³ × 1.045 × 10⁻²²

18.066 × 10²³ × 1.045 × 10⁻²² = 188.7897 g

≅ 188.8 g

Hence, the mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

Learn more on Stoichiometry here: brainly.com/question/13654901

5 0
1 year ago
What is the balanced form fir Na(s) + ao2(g) = Na2O(s)​
Dima020 [189]

Answer:

Balanced Chemical equation:

4Na + O₂ → 2Na₂O

Explanation:

Chemical equation:

Na + O₂ → Na₂O

Balanced Chemical equation:

4Na + O₂ → 2Na₂O

Four mole of sodium combine with one mole of oxygen and form two mole of sodium oxide.

Coefficient with reactant and products:

Na   4

O₂     1

Na₂O  2

Oxygen is present in group sixteen and have six valance electrons. while sodium is alkali metal and present in group one and have one valance electron.

Oxygen needs two electron to complete the octet while sodium need to lose the one electron to get the complete octet.

When oxygen is combine with sodium it gain its two valance electrons from two sodium atom and form anion while sodium loses its valance electron to wards oxygen and form cation. The bond form between them is ionic because one is metal and other is non metal and electrons are completely transfer from two sodium atom to one oxygen atom.

6 0
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