1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kati45 [8]
2 years ago
13

Look closely at the valence electrons in all eight columns of your table from part C. Which element's location does not

Chemistry
1 answer:
maw [93]2 years ago
5 0

Answer: helium(He)

Explanation: Helium has only 2 electrons in the outermost energy level, but all of the other elements in its column have eight.

You might be interested in
What was the unknown metal?
bulgar [2K]

Answer:

is there a picture or something?

Explanation:

5 0
3 years ago
Read 2 more answers
Define radioactivity and write down properties of radioactive Ray's
BlackZzzverrR [31]

Answer:

Explanation:

So basically is just explain what radioacitvity and then radidoactive

Radioactivity is the spontaneous release of energy from an unstable atom to get to a more stable state. Ionizing Radiation is the energy that comes out of a radioactive atom. Radioactive isotopes are radioactive atoms of the same element that have different numbers of neutrons.

6 0
3 years ago
Read 2 more answers
Cobalt III hydroxide and nitric acid react according to the following balanced equation:
kati45 [8]
The mass of cobalt (III) needed is
m = 5.2 L (0.42 mol/L) ( 93 g/mol)
m = 97.65 g

The volume of nitric acid needed is
V = 5.2 L (0.42 mol/L) (3 mol / 1 mol) (1000 mL/1.6 mol)
V = 1968.75 mL

The moles of water produced is
n = 5.2 L (0.42 mol/L) (3 mol / 1 mol)
n = 3.15 moles
6 0
2 years ago
Why is chemistry important in the study of biology? The body is composed of chemical elements. Chemical reactions occur in the b
Ede4ka [16]
All of the above.
................
:)

7 0
3 years ago
Read 2 more answers
A hypothetical element has an atomic weight of 48.68 amu. It consists of three isotopes having masses of 47.00 amu, 48.00 amu, a
Morgarella [4.7K]

Answer : The percent abundance of the heaviest isotope is, 78 %

Explanation :

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i

As we are given that,

Average atomic mass = 48.68 amu

Mass of heaviest-weight isotope = 49.00 amu

Let the percentage abundance of heaviest-weight isotope = x %

Fractional abundance of heaviest-weight isotope = \frac{x}{100}

Mass of lightest-weight isotope = 47.00 amu

Percentage abundance of lightest-weight isotope = 10 %

Fractional abundance of lightest-weight isotope = \frac{10}{100}

Mass of middle-weight isotope = 48.00 amu

Percentage abundance of middle-weight isotope = [100 - (x + 10)] %  = (90 - x) %

Fractional abundance of middle-weight isotope = \frac{(90-x)}{100}

Now put all the given values in above formula, we get:

48.68=[(47.0\times \frac{10}{100})+(48.0\times \frac{(90-x)}{100})+(49.0\times \frac{x}{100})]

x=78\%

Therefore, the percent abundance of the heaviest isotope is, 78 %

5 0
3 years ago
Read 2 more answers
Other questions:
  • When naming organic compounds, there are strict rules regarding punctuation.
    6·1 answer
  • What are the levels of orgamnization in a biome?
    10·1 answer
  • Which is a heterogeneous mixture?
    9·1 answer
  • The solvent was propanone. Which of the three basic colours is most soluble in propanone?​
    7·1 answer
  • Outer core made of alloy metal, mostly
    12·1 answer
  • In two or more complete sentences describe a primordial soup and explain its importance.
    14·1 answer
  • Please help thanks!
    6·2 answers
  • PLEASE HELP QUICKLY! SERIOUS ANSWER PLEASE
    12·1 answer
  • When 29 grams of sodium metal (Na) react with 49 grams of chlorine gas (C1), solid
    11·1 answer
  • Sa se calculeze presiunea exercitata de 2 moli de h2 într un vas cu vol de 10l la temperatura de 27gc
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!