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Shkiper50 [21]
4 years ago
10

If element x has 72 protons, how many electrons does it have? electrons

Chemistry
1 answer:
saw5 [17]4 years ago
6 0
Elements have neutral charges such as Na so if X has 72 protons + charges then it must also have 72 electrons with - charges

hope that helps
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Why does magnesium oxide have a higher lattice energy than calcium oxide?
Artist 52 [7]
Because the attractive forces are governed by the relationship F =  \frac{ q_{1}  q_{2}}{ r^{2} } we know that the bond strength between the ions of opposite charge depends on the charges on the ions and the distance between the centers of the ions when they pack to form a crystal.

In the example of MgO (magnesium oxide) and NaCl, MgO has a much higher lattice energy because the ions are +2 and -2, instead of +1 and -1.

But your problem doesn't deal with the magnitude of the charge; it concerns the ionic radii.

Smaller ions are packed closer together, meaning the attractive forces are working across a smaller distance and are thus stronger. We know based on periodic trends that as you move down a group, the ion radius increases. Therefore, the lattice energy decreases.

Both Mg and Ca are alkaline earth metals (group II on the periodic table). But Mg is one row above Ca, meaning its ionic radius is smaller. Therefore, its lattice energy is larger.
5 0
4 years ago
Was the creation of flubber a physical or chemical reaction
azamat
I'm pretty sure it's a chemical reaction.
7 0
4 years ago
How does the environment influence natural selection?
Nonamiya [84]
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7 0
3 years ago
Write an equation for the neutralization of lemon juice with baking soda. Your equation should show a proton transfer to form ca
Jobisdone [24]

The equation of the neutralization reaction is:

HOC(CO₂H)(CH₂CO₂H)₂ + Na₂CO₃ ----> HOC(CO₂Na)(CH₂CO₂Na)₂ + H₂O

<h3>What is the acid in lemon juice?</h3>

The main acid in lemon juice is citric acid.

Citric acid is a tricarboxylic acid and will react with baking soda to form a salt and water.

The equation of the neutralization reaction is shown below:

HOC(CO₂H)(CH₂CO₂H)₂ + Na₂CO₃ ----> HOC(CO₂Na)(CH₂CO₂Na)₂ + H₂O

In conclusion, the neutralization of citric acid in lemon juice produces a salt and water.

Learn more about neutralization reaction at: brainly.com/question/15042730
#SPJ1

8 0
2 years ago
A possible mechanism for the overall reaction Br2 (g) + 2NO (g) → 2NOBr (g) is NO (g) + Br2 (g) rightwards arrow with k space 1
omeli [17]

Answer : The rate law for formation of NOBr based on this mechanism is, \frac{k_1\times k_2}{k_1^-}[Br_2][NO]^2

Explanation :

The overall reaction is:

Br_2(g)+2NO(g)\rightleftharpoons 2NOBr(g)

Rate law = k[Br_2][NO]^2

The first step of the overall reaction is:

NO(g)+Br_2(g)\overset{k_1}{\rightarrow} NOBr_2(g)

NO(g)+Br_2(g)\overset{k_1^-}{\leftarrow} NOBr_2(g)

Rate law 1 = k_1[Br_2][NO]

Rate law 2 = k_1^-[NOBr_2]

The second step of the overall reaction is:

NOBr_2(g)+NO(g)\overset{k_2}{\rightarrow} 2NOBr

Rate law 3 = k_2[NOBr_2][NO]

Now rate law of overall reaction can be obtained as follows.

We are multiplying rate law 1 and rate law 3 and dividing by rate law 2, we get:

Rate law = \frac{[k_1[Br_2][NO]]\times [k_2[NOBr_2][NO]]}{[k_1^-[NOBr_2]]}

Rate law = \frac{k_1\times k_2}{k_1^-}[Br_2][NO]^2

Rate law = k[Br_2][NO]^2

The rate law for formation of NOBr based on this mechanism is, \frac{k_1\times k_2}{k_1^-}[Br_2][NO]^2

4 0
3 years ago
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