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
Margarita [4]
3 years ago
8

Which of the following elements has two valence electrons?

Chemistry
2 answers:
Nastasia [14]3 years ago
7 0

The Correct answer is (A) Sr element.


The explanation:


by looking at the periodic table and look at Group 2 which has elements with two valences we can see the Sr element


and its outer shell has 2 valence electrons.


so, Sr is the element that has two valence electrons.

REY [17]3 years ago
4 0
The element A. Sr, or strontium, has two valence electrons. You can find this information by locating it on the Table of Elements, where it is in Group 2.
You might be interested in
A buffer solution contains 0.11 mol of acetic acid and 0.13 mol of sodium acetate in 1.00 L. What is the pH of this buffer?
aleksley [76]

Answer:

Henderson Hasselbalch equation: pH = pKa + log [salt]/[acid]

You need to know the pKa for acetic acid. Looking it up one finds it to be 4.76

(a). pH = 4.76 + log [0.13]/[0.10]

= 4.76 + 0.11

= 4.87

(b) KOH + CH3COOH =>H2O + CH3COOK so (acid)goes down and (salt)goes up. Assuming no change in volume, you have 0.10 mol acid - 0.02 mol = 0.08 mol acid and 0.13 mol salt + 0.02 mol = 0.15 mol salt

pH = 4.76 + log [0.15]/[0.08]

= 4.76 + 0.27

= 5.03

5 0
4 years ago
2. Aim: I don't know, i don ​
Sonja [21]

I dunnnooooooo dunnooooo

6 0
2 years ago
Read 2 more answers
What is the final volume (L) of a 1.00 L system at 315 K and 1.10 atm if STP conditions are established?
LenaWriter [7]

Answer:

0.95L

Explanation:

Data obtained from the question include:

V1 (initial volume) = 1L

T1 (initial temperature) = 315K

P1 (initial pressure) = 1.10 atm

T2 (final temperature) = stp = 273K

P2 (final pressure) = stp = 1atm

V2 (final volume) =?

Using the general gas equation P1V1/T1 = P2V2/T2, the final volume of the system can be obtained as follow:

P1V1/T1 = P2V2/T2

1.1 x 1/315 = 1 x V2/273

Cross multiply to express in linear form.

315 x V2 = 1.1 x 273

Divide both side by 315

V2 = (1.1 x 273) /315

V2 = 0.95L

Therefore, the final volume of the system if STP conditions are established is 0.95L

5 0
3 years ago
Find the mass in grams of 5.34 *10^20 atoms of carbon molar mass 12g
emmasim [6.3K]

0.01068‬g

Explanation:

Given parameters :

Number of atoms = 5.34 x 10²⁰ atoms

Molar mass of carbon = 12g

Unknown:

Mass of carbon = ?

Solution:

A mole of a substance is unit that contains the Avogadro's number of particles.

   1 mole = 6.02 x 10²³ atoms ;

 In  5.34 x 10²⁰ ;

   Number of moles = \frac{5.34 x 10^{20} }{6.02 x 10^{23} }  = 8.9 x 10⁻⁴moles

Mass = number of moles  x molar mass = 8.9 x 10⁻⁴ x 12 = 0.01068‬g

learn more:

Molar mass brainly.com/question/2861244

#learnwithBrainly

6 0
4 years ago
Which distinguishes an atom of one element from an atoms of a different element?<br> Please help
yaroslaw [1]

Answer:

because the number of electrons and protons differs

3 0
3 years ago
Read 2 more answers
Other questions:
  • What would be the best microscope to view living single-celled organisms in a sample of pond water? (2 points)
    13·1 answer
  • Which of the following is the correct word equation for the reaction described below?
    11·2 answers
  • An unknown gas effuses twice as fast as CH. What is the molar mass of the gas?
    6·1 answer
  • Which on goes where please help!!!
    11·1 answer
  • Assume that the ratio of moles of Cl to moles of Cu are 2.39. If we can represent the formula by CuClx, what is the value for x?
    9·1 answer
  • Lab report calorimetry and specific heat <br> HELP PLZ
    9·1 answer
  • Is aluminium more reactive than copper?​
    6·2 answers
  • Are starch molecules or glucose molecules bigger?
    13·1 answer
  • 10.
    12·1 answer
  • To illustrate the arrangements of particles in a liquid , a teacher instructed 20 students
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!