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3 years ago

In the ground state, which atom has a completely filled valence electron shell?(1) C (2) V (3) Ne (4)Sb

2 answers:

7 0

The answer is (3)Ne. Usually, the elements belongs to group 18 all have completely filled valence electron shell. Among the four elements carbon, vanadium, neon and antimony, only neon belongs to group 18.

Irina18 [472]3 years ago

6 0

In the ground state, the atom that has a completely filled valence electron shell is NEON, Ne.

In the periodic table of elements, the elements that have completely filled valence electron shell are the noble gases and neon is one of them. The noble gases has eight electrons each in their outermost shells, this makes them to be stable and thus, they are unreactive in nature. The other elements in the periodic table usually undergo chemical reactions in order to have eight electrons in their outermost shells just like the noble gases.

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Which of the four containers represents a compound? A) Cl B) H2O C) N2 D) Na

MissTica

B)H20 Hydrogen+oxygen=H2O
(Water) you should know this

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3 years ago

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Between room temperature and its melting point (1132C), pure U metal exists in three crystal phases: alpha, beta, and gamma. Tra

kifflom [539]

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3 years ago

tetraphosphorous hexaoxide is formed by the reaction of phosphorous (p4) with oxygen gas. if the reaction of 75.3 g of p4 with 3

True [87]

the Percentage yield for the reaction = 48.8%

What is Percentage yield ?

The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield. The percent yield is 100% if the theoretical and actual yields are equal. Because the real yield is frequently lower than the theoretical value, percent yield is typically lower than 100%. This may be due to incomplete or conflicting reactions or sample loss during recovery. If the percent yield is more than 100%, more sample than expected was retrieved from the reaction.

4 P + 3 O2 = P4O6

moles P = 75.3 g / 30.9738 g/mol= 2.43

moles O2 required = 2.43 x 3 / 4=1.82

actual moles O2 = 38.7 g /32 g/mol=1.21 so O2 is the limiting reactant

theoretical moles P4O6 = 1.21 / 3=0.403

theoretical mass P4O6 = 0.403 mol x 219.895 g/mol=88.6 g

% yield = 43.3 x 100/ 88.6 = 48.8 %

the Percentage yield for the reaction = 48.8%

To know about Percentage yield from the link

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4 0

1 year ago

A change in color when two solutions are mixed together is a clue that a _____ has taken place. physical change change in state

kondaur [170]

Answer:

Chemical change

Step-by-step explanation:

A change in colour indicates that a new substance with different properties (colour) has been formed. This is a chemical change.

A. is wrong. A physical change does not usually cause a change in colour.

B. is wrong. No new gas or solid was formed,

C. is wrong. There is a colour change, not a temperature change.

8 0

3 years ago

Read 2 more answers

Help with this worksheet please (24pts)

Igoryamba

Atoms that loss or gain electrons are called ions. There are two types of ions: cations and anions.
Here, 2+ represents that Calcium (Ca) should gain 2 more electrons so that its number equals to that of protons.
3- represents that Nitrogen (N) should loss 3 electrons to equivalent with the number of protons.
Here, anions are S^2-, P^3-, Se^2-, Br^-.
While cations are Cr^3+, Ag^+, Li^+, Ba^2+.
The number of protons of Magnesium (Mg) = 12
The number of nuetrons of Mg = 12
The number of electrons of Mg = 12

Hope you could get an idea from here.

Doubt clarification - use comment section.

7 0

3 years ago