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Lostsunrise [7]
3 years ago
6

Which statement concerning elements is true? (1) Different elements must have different numbers of isotopes. (2) Different eleme

nts must have different numbers of neutrons. (3) All atoms of a given element must have the same mass number. (4) All atoms ofa given element must have the same atomic number
Chemistry
1 answer:
Lana71 [14]3 years ago
8 0

Answer:

(4) All atoms of a given element must have the same atomic number

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

However, when we talk about the atomic number of the ion, it is not equal to the number of electrons as electron can be gained or loosed.

This is why, more appropriately, the number of the protons which are present in the nucleus of the atom is called the atomic number.

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

<u>Thus, atomic number of an element is an unique property of the element and it's atom.</u>

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kondor19780726 [428]

Answer:

.156   M

Explanation:

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1/4 * .625 = .15625

8 0
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What are some examples of properties of water?
gavmur [86]
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3 years ago
Which element is most reactive sodium,magnesium, or aluminum and why?
ludmilkaskok [199]
Magnesium would be more reactive.
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3 years ago
The wastewater solution from a factory containing high levels of salts needs to be diluted before it can be released into the en
Vesna [10]

Answer:

3.5 atm

Explanation:

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The difference in osmotic pressure of the solutions is:

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pressure required = Δπ = (0.190 - 0.048) M x 0.821 Latm/Kmol x 298 K

= 3.47 atm

3 0
3 years ago
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wlad13 [49]

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