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77julia77 [94]
1 year ago
11

Urn the gas off immediately if the flame sputters, flares, or goes out, or if you ________________________ gas.

Chemistry
1 answer:
Lemur [1.5K]1 year ago
7 0

Turn the gas off immediately if the flame sputters, flares, or goes out, or if you smell gas.

To learn more about gas fire visit: brainly.com/question/12030041

#SPJ4

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 there are 78 neutrons.

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There should be 2 since there’s 2 D atoms in the reaction.
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What is the mass of the oxygen in one mole of calcium phosphate
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Answer:

16.00 g/mol

Explanation:

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2 years ago
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The teacher shows students a pictorial model of an atom. Which element is
frutty [35]

Answer:

C. Fluorine because the model has 9 protons which is represented by the atomic number

Explanation:

We usually identify an element by the number of protons in them. The number of protons is the atomic number of an atom.

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  • This number of protons is the atomic number.
  • According to the periodic law, atoms are arranged on the periodic table based on their atomic number.
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4 0
2 years ago
Use the periodic table to determine the electron configuration for Ca and Pm in noble-gas notation Ca: [Ar]4s2 [Ar]4s1 [Ar]3s2 [
sveta [45]
Answer:

1) Ca: [Ar]4s²
2) Pm: [Xe]6s²4f⁵

Explanation:

1) Ca:

Its atomic number is 20. So it has 20 protons and 20 electrons.

Since it is in the row (period) 4 the noble gas before it is Ar, and the electron configuration is that of Argon whose atomic number is 18.

So, you have two more electrons (20 - 18 = 2) to distribute.

Those two electrons go the the orbital 4s.

Finally, the electron configuration is [Ar] 4s².

2) Pm

The atomic number of Pm is 61, so it has 61 protons and 61 electrons.

Pm is in the row (period) 6. So, the noble gas before Pm is Xe.

The atomic number of Xe is 54.

Therefore, you have to distribute 61 - 54 = 7 electrons on the orbitals 6s and 4f.

The resultant distribution for Pm is: [Xe]6s² 4f⁵.
5 0
2 years ago
Read 2 more answers
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