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Norma-Jean [14]
3 years ago
12

The mass number of an atom is the sum of the atomic number and the number of..

Chemistry
1 answer:
Len [333]3 years ago
8 0
The answer here is neutrons
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What is the concentration of the hydroxide ion? Given that the concentration of the hydronium ion is 2.3 X 10^-7 M
professor190 [17]

Answer:

4.35 * 10^-8 M

Explanation:

Since the concentration of the hydronium ion= 2.3 X 10^-7 M

And we know that;

[H3O^+] [OH^-] = 1 * 10^-14

[H3O^+]  = concentration of the hydronium ion

[OH^-] = concentration of the hydroxide ion

So;

[OH^-] =1 * 10^-14/[ H3O^+]

But [H3O^+] = 2.3 X 10^-7 M

[OH^-] = 1 * 10^-14/2.3 X 10^-7

[OH^-] = 4.35 * 10^-8 M

8 0
3 years ago
The element thallium is 70% thallium-205 and 30% thallium-203. Calculate its relative atomic mass to 1 decimal place.
xxMikexx [17]

Answer:

answer-

The relative atomic mass = 204.4

explanation:

Thallium -203 = 30%

Thallium -205 = 70%

Therefore ,

relative mass of thallium = (30×203 + 70×205)/100

relative mass of thallium = (20440)/100

relative mass of thallium = 204.40 amu

Thus,

relative atomic mass of thalium =204.4 ( to 1 decimal place)

6 0
3 years ago
Is the tendency of copper to turn green when exposed to air chemical or physical property?
Zielflug [23.3K]
<u>Chemical</u>. The copper atoms form new chemical bonds with atoms in the air.
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What would happen if a neutron was added to Lithium (7)
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if you add a neutron to lithium-7 it becomes a compound nucleus of lithium-8

8 0
3 years ago
Approximately how many atoms make up 2.3 moles of gallium?
Len [333]
I think its b I think
5 0
3 years ago
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