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3 years ago

How to know how many valence electrons are in an element

Chemistry

1 answer:

Alenkinab [10]3 years ago

7 0

Answer:

Hope it helped

Explanation:

For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.

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A colorless solution is known to contain one of these ions. Which ion is present if adding dilute HCl produces a white precipita

marta [7]

Answer:

The correct answer is option D.

Explanation:

All the cations given belong to the group-1 cation and will give precipitate of their respective chlorides when HCl is added to their aqueous solution.

$Ag^+(aq)+HCl(aq)\rightarrow AgCl(s)+H^+(aq)$

$Cu^{2+}+(aq)+2HCl(aq)\rightarrow CuCl_2(s)+2H^+(aq)$

$Hg_{2}^{2+}+(aq)+2HCl(aq)\rightarrow Hg_2Cl_2(s)+2H^+(aq)$

$Pb^{2+}+(aq)+2HCl(aq)\rightarrow PbCl_2(s)+2H^+(aq)$

All the precipitates are insoluble in cold water but out of all these only lead(II) chloride is soluble in warm water.

4 0

3 years ago

The gas phosphine (PH3) is used as a fumigant to protect stored grain and other durable produce from pests. Phosphine is generat

Nezavi [6.7K]

<span>The gas phosphine (PH3) is used as a fumigant to protect stored grain and other durable produce from pests. Phosphine is generated where it is to be used by adding water to aluminum phosphide or magnesium phosphide. Give formulas for these two phosphides.

</span>Al₂P₃ + 3H₂O → 3PH₃ + Al₂O₃
MgP + H₂O → PH₃ + MgO

8 0

3 years ago

Read 2 more answers

Fill in the following: Sulfur--32 isotope notation: #p+ : #nº : #e- :

liq [111]

Answer:

me dont know

Explanation:

sumbody help me

7 0

2 years ago

If 35.8 grams of LiCl are dissolved in 184 grams of water, what is the concentration of the solution in percent by mass?

uysha [10]

Mass of solute = 35 grams
Mass of solution = mass of nacl + mass of water = 35.8 + 184 = 219.8 grams

Concentration = mass of Nacl x 100/mass of solution.

= 35x100/219.8 = 15.92%.

Hope this helps you.

7 0

3 years ago

Taxol is a potent chemotherapeutic agent (isolated from the Pacific Yew tree) which is especially effective against ovarian canc

butalik [34]

Answer:

Amine

Explanation:

The functional groups contained in Taxol are :

Ketone , Ester, Amide and Alcohol

while the functional group that is not contained in the Taxol is Amine

Taxol is a very potent anti-cancer chemotherapeutic, and it is also groped into a class called Taxanes and this makes it effective in the treatment of breast and ovarian cancer.

8 0

2 years ago