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vladimir1956 [14]
3 years ago
11

How many valance electrons does He need to get to 8

Chemistry
1 answer:
mote1985 [20]3 years ago
5 0

Answer:

Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons

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A warm air is rising as cooler air es in to take its place. what is the name for that?​
klasskru [66]

Answer:

convection

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Explanation:

6 0
3 years ago
A chemist who studies water samples did a demonstration of how to test for lead in water. She added a clear solution of potassiu
Lerok [7]

Answer:

The swirling yellow solid formed is lead iodide (PbI₂).

Explanation:

  • The reaction of potassium iodide (KI) with lead nitrate (Pb(NO₃)₂) will produce lead iodide (PbI₂) and potassium nitrate (KNO₃) according to the equation:

2KI + Pb(NO₃)₂ → PbI₂↓ + 2KNO₃

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3 0
3 years ago
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A chemist requires 0.802 mol Na2CO3 for a reaction. How many grams does this correspond to?
Komok [63]

Answer:

Ok:

Explanation:

So grams = mols*MolarMass. Here, MolarMass (MM) = 105.99g which can be found using the periodic table. mols is given to be 0.802. We can then plug in to get that it corresponds to 85.0g.

7 0
2 years ago
Using the VSEPR theory , what would the representation mean A central atom with 2 connected atoms atom with I lone pair of Jone
VLD [36.1K]

Answer:

The molecule has a bent geometry

Explanation:

Let us look again at the principles of VSEPR theory. The shape of a molecule depends on the number of electron pairs that surround the valence shell of the central atom in the molecule.

Lone pairs distort the molecular geometry away from what is expected on the basis of VSEPR theory.

The molecule described in the question has the form AEX2. Two substituents and one lone pair form three electron domains around the central atom. The expected geometry is trigonal planar but the observed molecular geometry is bent because of the lone pairs present.

3 0
3 years ago
Formula for the compound that contains Mg2+ and O2-
jeka94

Answer:

MgO.

Explanation:

charges of both satisfy one another (balanced) -- producing a compound MgO.

7 0
3 years ago
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