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expeople1 [14]
3 years ago
7

What is the first element on the periodic table?

Chemistry
2 answers:
tresset_1 [31]3 years ago
7 0
Hydrogen.
I hope this helps.
Galina-37 [17]3 years ago
4 0


Hydrogen, H.

I hope this helps!

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Identify each of the following sets of quantum numbers as allowed or not allowed in the hydrogen atom.
Westkost [7]

Answer:

See explanation.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to firstly recall the electron configuration of hydrogen:

1s^1

To realize that the principal quantum number is 1, the angular is 0 as well as the magnetic one; therefore we infer that all the given n's are not allowed, just l=0 is allowed as well as ml=0 yet the rest, are not allowed.

Best regards!

5 0
3 years ago
In 1803, John Dalton proposed an atomic theory. Three critical pieces of this theory included the following:
ValentinkaMS [17]
D. Proton, electron, neutron.
6 0
3 years ago
Calculate the moles and grams of solute in each solution. D. 2.0 L of 0.30M Na2SO4. I already have A, B, and C. Thanks!
e-lub [12.9K]
Find the number of moles
C = n / V
C(Concentration) = 0.30 moles / L
V ( Volume) = 2 L
n = ??
n = C * V
n = 0.30 mol / L * 2 L
n = 0.60 mol


Find the molar mass
2Na = 23 * 2 = 46 grams
1S   = 32 * 1 = 32 grams
O4   = 16 * 4 = 64 grams
Total =            142 grams / mol

Find the mass
n = given mass / molar mass
n = 0.06 mol
molar Mass = 142 grams / mol
given mass = ???

given mass = molar mass * mols
given mass = 142 * 0.6
given mass = 85.2 grams. 

85.2 are in a 2 L solution that has a concentration of 0.6 mol/L


4 0
3 years ago
Read 2 more answers
PLEASE HURRY. Which of the molecules below is propyne?
Oduvanchick [21]

The last photo because its molecular formula is C3H4.

7 0
3 years ago
Read 2 more answers
PLEASE HELP THANKS
dimaraw [331]

Answer:

i think 35 degrees Celsius

Explanation:

cause its the same temperature

3 0
3 years ago
Read 2 more answers
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