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
Alexandra [31]
3 years ago
13

Magnesium is an alkaline earth metal with an atomic number of 12. It’s in the third row in the periodic table. Which expression

shows one way to find the number of valence electrons in one atom of magnesium?
Chemistry
1 answer:
Leviafan [203]3 years ago
7 0

Answer:

group # = # valence electrons

group 2= 2 valence electrons

Explanation:

Mg is in group #2 and subsequently has 2 valence electrons (electrons on the outermost shell)

You might be interested in
Give an example of how environmental science might involve geology and chemistry.
Sever21 [200]
One of the examples is radiation and chemistry of water. Environmental science requires the capacity to integrate data from the greater part of the significant fields of science, and in addition from arithmetic. 
Geology is vital on the grounds that huge scale arrives forms make geology. The presence of mountains and valleys influences how much daylight and precipitation achieve the ground, how breezy an area is, the manner by which precipitation keeps running off, and numerous different variables that figure out what plants and creatures will have the capacity to occupy a district.
8 0
3 years ago
Which of the following is an isotope of hydrogen​
Lena [83]
Z=1 is the formula i would have to see the following lol
7 0
3 years ago
4. a compound called pyrene has the empirical formula c8h5. when 4.04 g of pyrene is dissolved in 10.00 g of benzene, the boilin
e-lub [12.9K]

The molecular mass of pyrene is 204.4 g/mol.

From;

ΔT = Kb m i

Where;

  • ΔT = boiling point elevation
  • Kb = boiling point constant
  • m = molality
  • i = Van't Hoff factor

Since the compound is molecular; i = 1

The number of moles of pyrene = 4.04 g/MM

Where; MM = molar mass of pyrene

molality = number of moles of pyrene/mass of solvent in Kg

The mass of solvent = 10 g or 0.01 Kg

molality =  4.04 g/MM/0.01

ΔT = Boiling point of solution - Boiling point of pure solvent

ΔT = 85.1°C - 80.1°C

ΔT = 5°C

5 = 2.53 × 4.04 g/MM/0.01 × 1

5 = 10.22 × 1/0.01 MM

0.05MM = 10.22

MM= 10.22/0.05

MM= 204.4 g/mol

Learn more: brainly.com/question/2292439

3 0
2 years ago
Consider the nuclear equation below.
Dovator [93]

Answer:

its NOT C

Explanation:

8 0
3 years ago
Read 2 more answers
A blood test shows clumps only in wells containing anti-A and anti-B antibodies. The Rhesus test was negative. Which is the corr
enyata [817]
The correct blood type is AB-
3 0
3 years ago
Other questions:
  • The explosions that take place during a fireworks show are an example of which of the following?Image of fireworks exploding in
    5·2 answers
  • Convert 0.85 x 10-12 km to nm.
    12·2 answers
  • What happens to the molarity of bleach when you prepare a solution using 1 gallon of water and 5 table spoons of bleach (sodium
    7·1 answer
  • True or false: different substances are made up of different types of atoms
    12·2 answers
  • A sample of gas has a volume of 2.4 L and a pressure of 1.2 atm. What would the pressure of the same gas sample be if the volume
    6·1 answer
  • How can pH go high over time
    7·2 answers
  • 50.0 mL of an HNO^3 solution were titrated with 36.90 mL of a 0.100 M LiOH solution to reach the equivalence point. What is the
    13·1 answer
  • The atomic mass of magnesium is the weighted average of the atomic masses of
    10·1 answer
  • Need helped for this
    12·1 answer
  • Explain the law of conservation of energy.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!