All categories

3 years ago

What element in the second period has the largest atomic radius?

Chemistry

1 answer:

Basile [38]3 years ago

6 0

Answer:

Explanation:

You might be interested in

Aluminum oxide (Al2O3) occurs in nature as a mineral called corundum, which is noted for its hardness and resis- tance to attack

Neko [114]

Answer:

7.03×10²³ atoms of Al

Explanation:

Corundum density = 3.97g/cm³

Corundum = Al₂O₃. Then, you have 2 moles of Al and 3 moles of O in 1 mol of the compound.

Let's determine the mass of corundum, by density

Corundum density = Corundum mass / Corundum volume

3.97 g/cm³ = Corundum mass / 15cm³

3.97 g/cm³ . 15cm³ = Corundum mass →59.55 g

Now, let's find out how many moles are in that mass of corundum

1 mol of Al₂O₃ weighs 101.96 g/mol

Then, 101.96 grams of oxide have 2 moles of Al

59.55 g of oxide, will have (59.55 .2)/101.96 = 1.17 moles

Now, we can know the quantity of atoms, by this rule of three

1 mol has NA atoms (6.02×10²³)

1.17 moles will have (1.17 . NA) = 7.03×10²³ atoms of Al

5 0

3 years ago

What is the element of 1s^22s^2p^63s^23p^64s^23d^104p^65s^24d^105p^1

77julia77 [94]

The answer is Indium

7 0

3 years ago

HELP PLEASE!

tia_tia [17]

Vocabulary. Balanced chemical equation: A chemical equation in which the number of each type of atom is equal on the two sides of the equation.

Hope I helped! (´▽`)

__________________________________________________________

単語。平衡化学反応式：各タイプの原子の数が方程式の両側で等しい化学反応式。

私が助けてくれたらいいのに！(´▽`)

5 0

3 years ago

Read 2 more answers

As the [H] In a solution decreases, what happens to the [OH-]?

valentinak56 [21]

C. It increases and the pH stays constant.

5 0

3 years ago

Which of the following best explains why electroplating is a useful process in many industries?

UkoKoshka [18]

Since I cannot find the choices, I will tell you some of the benefits of electroplating in different industries. You can compare these benefits with the choices you have and choose the best fit.

1- Forms a protective layer to protect the material from the conditions of the atmosphere as the corrosion

2- Improves the appearance of some inexpensive materials and makes them look more appealing

3- Can enhance the electrical conductivity of materials

4- electroplating of zinc-nickel or gold can survive high temperatures

5- Sometimes hardens the material

6- Increases the thickness of the material

8 0

3 years ago

Read 2 more answers