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
SashulF [63]
3 years ago
12

What element has 4 energy levels and 1 valence electron ​

Chemistry
1 answer:
ryzh [129]3 years ago
3 0

Answer: Hydrogen and helium, both in the first period, have their valence electrons in the principal energy level n=1.

Hope this helps.......... Stay safe and have a Merry Christmas!!!!!!!!!! :D

Explanation:

You might be interested in
What % of all the atoms in the universe are hydrogen
irga5000 [103]

Answer:

Over ninety percent of all the atoms in the Universe are hydrogen atoms.

Explanation:

Over ninety percent of all the atoms in the Universe are hydrogen atoms. By mass, hydrogen makes up about 75% of all matter in the Universe. Hydrogen atoms are also the smallest and lightest of all the atoms with only one electron and one proton in a common single hydrogen atom (called protium).

5 0
4 years ago
At what time will the pressure of SO₂Cl₂ decline to 0.50 its initial value? Express your answer using two significant figures.
QveST [7]

Answer: The time is 0.69/k seconds

Explanation:

The following integrated first order rate law

ln[SO₂Cl₂] - ln[SO₂Cl₂]₀ = - k×t

where

[SO₂Cl₂] concentration at time t,

[SO₂Cl₂]₀ initial concentration,

k rate constant

Therefore, the time elapsed after a certain concentration variation is given by:

t=\frac{ln[SO_{2}Cl_{2}]_{0} - ln[SO_{2}Cl_{2}]}{k}=\frac{ln\frac{[SO_{2}Cl_{2}]_{0}}{[SO_{2}Cl_{2}]} }{k}

We could assume that SO₂Cl₂ behaves as a ideal gas mixture so partial pressure is proportional to concentration:

p_{(SO_{2}Cl_{2})}V = n_{(SO_{2}Cl_{2})}RT

[SO_{2}Cl_{2}]= \frac{n_{(SO_{2}Cl_{2})}}{V}}=\frac{p_{(SO_{2}Cl_{2})}}{RT}}

In conclusion,

t = ln( p(SO₂Cl₂)₀/p(SO₂Cl₂) )/k

t=\frac{ln\frac{p_{(SO_{2}Cl_{2})}_{0}}{p_{(SO_{2}Cl_{2})}} }{k}

for

p_{(SO_{2}Cl_{2})}=0.5p_{(SO_{2}Cl_{2})}_{0}

t=\frac{ln\frac{p_{(SO_{2}Cl_{2})}_{0}}{0.5p_{(SO_{2}Cl_{2})_{0}}} }{k}

t=\frac{ln\frac{1}{0.5} }{k}

t=\frac{ln(2)}{k}

t=\frac{0.69}{k}}

7 0
3 years ago
1) 0.143 g Mg into atoms<br> 2) 0.101 kg Ti into atoms
Neporo4naja [7]

Answer:

The answer to your question is below

Explanation:

1) 0.143g of Mg into atoms

- Look for the atomic number of Magnesium in the Periodic table              

Atomic number = 24.31 g

-Use the Avogadro's number to find the number of atoms

                          24.31g ------------------- 6.023 x 10²³ atoms

                           0.143 g -----------------  x

                           x = (0.143 x 6.023 x 10²³) / 24.31

                           x = 8.613 x 10²² / 24.31

                           x = 3.54 x 10²¹ atoms

2) 0.101 kg of Ti into atoms

-Look for the atomic number of Titanium in the Periodic table

Atomic number = 47.87 g

-Use the Avogadro's number to find the number of atoms

                      47.87 g --------------------- 6.023 x 10²³

                      101 g    ----------------------  x

                       x = (101 x 6.023 x 10²³) / 47.87

                       x = 6.08x 10²⁵ / 47.87

                      x = 1.27 x 10²⁴ atoms                            

3 0
3 years ago
Is pizza a element compound homogeneous mixture or heterogeneous mixture?
UNO [17]
<span> Pizza is a heterogeneous mixture Can I get Brainliest??</span>
4 0
3 years ago
If 30.0 mL of a 12.0 M hydrochloric acid (HCI) stock solution is diluted to a volume of 500.0 mL,
klemol [59]

Answer:

The concentration of dilute solution is 0.72M

Explanation:

According to the given question

V1=30 ml

 S1 = 12 M

 V2= 500 ml

then S2 =?

  we all know that V1S1=V2S2

                           or  S2= V1S1÷V2

                            or  S2 = 30×12÷500

                             or  S2= 360÷500

                             or  S2  =0.72 M.

The concentration of dilute solution is 0.72 M

5 0
3 years ago
Other questions:
  • Ligand field diagram for octahedral complex explain briefly
    10·1 answer
  • What will be the cost of gasoline for a 4,700-mile automobile trip if the car gets 41 miles per gallon, and the average price of
    13·2 answers
  • 9.
    7·1 answer
  • A piece of lead with a mass of 14.9 grams at a temperature of 92.5 degrees Celsius is dropped into an insulated container of wat
    11·2 answers
  • Lead has a density of 11.3 g/cm3. what is the volume of a 15.1 g block of lead?
    11·1 answer
  • Suppose the half-life of element k is 20 minutes. if you have a 200 g sample of k, how much of element k will be left after 60 m
    10·2 answers
  • What is the hybridization of the central atom in the phosphorus pentafluoride (PF3) molecule?
    7·1 answer
  • 10. The elements in group 1 are called
    15·1 answer
  • What is the pH of 0.001 M HNO,?
    13·2 answers
  • 21 III
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!