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
Ratling [72]
2 years ago
5

How many valence electrons are in the outermost energy level of each of the following elements? A. Helium B. Lithium C. Nitrogen

D. Magnesium
Chemistry
1 answer:
aleksklad [387]2 years ago
8 0
<span>A. Helium </span>atomic number 2
hope it helps
You might be interested in
A solution with a higher concentration of hydroxide ions (oh-) than hydrogen ions (h+)
Hoochie [10]
A solution with a higher concentration of hydroxide ions than hydrogen ions is basic solution.

This solution formed by Base dissolved in water and release hydroxide ions.

The PH of the solution is greater than 7
5 0
2 years ago
Ensure you write the states of the reactants and products.
slamgirl [31]
<h3>Answer:</h3>

Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction:

2H3PO4 + 3Mg(OH)2 → Mg3(PO4)2 + 6H2O

(solid) (solid) (solid) (liquid)

<h3>Explaination:</h3>

This is a typical neutralization reaction of an acid with a base to form a salt and water. The reaction is exothermic, gives off heat,

ΔH < 0 , and may be balanced by adding balancing numbers in front, ie adding molecules, in order to ensure that the total number of atoms of each element is the same on the left and right hand sides of the equation.

Doing so we obtain :

2H3PO4 + 3Mg(OH)2 → Mg3(PO4)2 + 6H2O

(solid) (solid) (solid) (liquid)

<h3>hope it helps :)</h3>
6 0
2 years ago
Read 2 more answers
A mixture of two or more kinds of molecules, evenly dispersed would be a(n)
Dvinal [7]
Azeotropic mixture. I think
5 0
2 years ago
Explain how you can convert from the number of representative particles of a substance to moles of that substance.
Scrat [10]

Answer:

  • the number of representative contain in 1 mol of a substance equals to 6.o2x10^23 particles.
8 0
2 years ago
Which of the following are likely to form a covalent bond?
Alex17521 [72]
C) hydrogen and oxygen atoms
5 0
2 years ago
Read 2 more answers
Other questions:
  • Place a check next to each elementary reaction
    7·1 answer
  • A solution of cough syrup contains 5.00% active ingredient by volume. If the total volume of the bottle is 14.0 mL , how many mi
    8·2 answers
  • The reaction of aluminum with bromine is shown here. The equation for the reaction is
    15·1 answer
  • 1) When chromium chloride, CrCl2, is dissolved in water, the temperature of the water decreases. a) Is the heat of solution exot
    13·1 answer
  • What structure in a bacterial cell controls which substances enter and leave the cell?
    12·1 answer
  • Marjorie is trying to determine the identity of an unknown substance. After running tests, she determines that the substance is
    9·1 answer
  • Try It: Evidence of Population Change
    14·1 answer
  • Is hydrogen a solid liquid or gas?
    8·1 answer
  • Help for a magazine article on horses for my little sister:
    13·1 answer
  • Which statement is true about the particles of a liquid when the liquid changes into a solid?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!