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
JulsSmile [24]
3 years ago
8

Help Me Please

Chemistry
2 answers:
GaryK [48]3 years ago
6 0

in the periodic table, elements are classified in the ascending order of their atomic numbers. atomic number is the number of protons

in elements the number of protons is equal to the number of electrons

the condensed notation of electron configuration is when the symbol of the noble gas closest to the elements electron configuration is mentioned.

[He] 2s² - number of electrons in He is 2 , and 2 more electrons in the s subshell adds upto a sum of 4 electrons. number of protons = number of electrons

then number of protons = 4

then atomic number is 4. element with atomic number 4 is Be

the element is Be


[Ne] 3s² 3p⁵

Ne atomic number is 10. 10 + 7 electrons in the third shell = 17 electrons in total

atomic number - 17 is Cl

element is Cl


[Xe] 6s¹

Xe atomic number is 54, 54 + 1 electron in the sixth shell = 55 electrons in total

atomic number of 55 is Cs

element is Cs


[Ar] 4s² 3d⁹

Ar atomic number is 18. 18 + 2 electrons in 4th shell and 9 in d subshell of 3rd shell = 29 electrons in total

atomic number of 29 is Cu

element is Cu

Shtirlitz [24]3 years ago
6 0
[He]2s2: Be
[Ne]3s23p5: Cl
[Xe]6s1: Cs
<span> [Ar]4s23d9: Cu</span>
You might be interested in
The equilibrium constant for the reaction of carbon monoxide with water is 1.845. if 1.00 mol of each reactant is placed in a 2.
SpyIntel [72]
[CO] = 1 mol / 2L = 0.5 M

[
According to the equation:

and by using the ICE table:

             CO(g) + H2O(g) ↔   CO2(g) + H2(g)

initial     0.5            0.5                    0          0

change  -X              -X                   +X         +X
     
Equ       (0.5-X)       (0.5-X)                     X            X

when Kc = X^2 * (0.5-X)^2

by substitution:

1.845 = X^2 * (0.5-X)^2  by solving for X 

∴X = 0.26

∴ [CO2] = X = 0.26
4 0
3 years ago
If one mole of a substance has a mass of 56.0 g, what is the mass of 11 nanomoles of the substance? Express your answer in nanog
9966 [12]

Answer:

616,0 ng is the right answer.

Explanation:

You should know that 1 mole = 1 .10^9 nanomoles

Get the rule of three.

1 .10^9 nanomoles ...................... 56.0 gr

11 nanomoles .....................

(11 x 56) / 1 .10^9 nanomoles = 6.16 x 10^-7 gr

Let's convert

6.16 x 10^-7 gr x 1 .10^9 = 616 ngr

8 0
3 years ago
What is largest value for the third quantum number
Kryger [21]

Answer:

18.

Explanation:

3s^2 3p^6 d^10

4 0
2 years ago
Which of the following is one part of a chemical formula?
melomori [17]

Answer:

C

Explanation:

You would be correct in guessing C as in a chemical formula symbol of each element is stated.

Like Salt is Sodium Chloride, and its chemical formula is NaCl (Na=sodium, Cl= chloride)

7 0
3 years ago
(I00p)A chemical equation example of a replacement of 1 ion for another in a compound! I need an example
snow_tiger [21]
A single replacement reaction could look like this:

2FeCl3 + 3Ba ➡️ 3BaCl2 + 2Fe

In this reaction, the barium is replacing the iron bound to the chlorine.
8 0
3 years ago
Other questions:
  • Money management becomes more important when you are responsible for paying all your own expenses.
    9·2 answers
  • If a liquid has a volume of 5800 mL and you need the mass in Liters, will the number appear to
    11·1 answer
  • I NEED ASAP!
    12·2 answers
  • A car accelerates from 0 to 72 km/hour in 6.0 seconds. What is the car's acceleration?
    6·2 answers
  • What may form when magma comes to the surface?
    14·2 answers
  • What was the hiker's average velocity during part C of the hike?
    8·1 answer
  • What is needed for photosynthesis to take place? (Select all that apply.)
    11·2 answers
  • A sample of a pure substance with a density of 3 g/mL is separated into two pieces. One piece has a mass of 50 g and the other p
    7·1 answer
  • Classify the following substituents according to whether they are electron donors or electron acceptors relative to hydrogen by
    5·2 answers
  • Determine the concerntration In [M] of a solution that has an absorbable of 0.420
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!