Ask question

Ask question

All categories

3 years ago

10

How does an elements period number related to the number of the energy level of its valence electrons?

1 answer:

Mrac [35]3 years ago

3 0

<span>There is a direct correlation between the period number and the energy level for valence electrons. For example, the H and He elements, in period 1, have their outer electrons in the energy level "1". This continues down the rows: all the elements in period 2 have their principal energy level as n = 2, period 3 has n = 3, and so on.</span>

You might be interested in

Select the correct answer. How does an atom become a positively charged ion? A. By gaining one or more electrons B. By gaining o

ser-zykov [4K]

C. By losing one or more electrons

6 0

3 years ago

Read 2 more answers

3. How many atoms of hydrogen do 3.575 mol of hydrogen sulfide contain?

Ksju [112]

Answer:

4.3043x10^24

Explanation:

Atoms(H) = (3.575 mol H2S/1)(2 mol H/1mol H2S)(6.02x10^23/1molH)

Simple stoicheometry problem. Sorry for taking so long, took Chem sophomore year, its been a while

4 0

3 years ago

2. Which one is the modal class?

Sonja [21]

Answer:

a.3-5 is the modal class.

7 0

3 years ago

cestrela7 [59]

a. The reactants are H2 and O2

b. The product is H2O

c. Yes, the reaction balanced because the number of atoms of each element is the same. It can be seen from coefficient and index on the compound

5 0

2 years ago

how many moles of solute are contained in 500.00 milliliter solution that has a concentration of 0.35M

igomit [66]

1.75 moles of Solute or 1.75n.

To find this, you'll need to use the molarity equation which is M = $\frac{n}{v}$

List the given items to organize better:

M (Molarity) = .35

V (Volume) = 5L [must always be in Liters]

n (Moles) = ?

Now, for the equation, substitute the variables with the given numbers:

.35 = $\frac{n}{5}$

Isolate the variable by multiplying the volume, 5, onto both sides. This will give you the answer of:

1.75 = n

Hope this helps!

6 0

3 years ago