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3 years ago

How do scientists determine the number of neutrons in an isotope of an atom?

2 answers:

5 0

Scientists can calculate the number of neutrons by subtracting the atomic number from the atomic mass. The atomic number of an element is the number of protons which can be found in the nucleus of the element's atoms. The atomic mass of an element is the product of protons plus neutrons. The number of neutrons is not always equal to the number of protons. By subtracting the atomic number from the atomic mass, the difference will be how many neutrons are in the element's nucleus.

gulaghasi [49]3 years ago

5 0

D. They subtract the atomic number from the atomic mass.

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Which element has two valence electrons?

Colt1911 [192]

Answer:

It is A) Calcium

Explanation:

Calcium has an electronic configuration of 2,8,8,2

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3 years ago

Read 2 more answers

A 59.1 sample of aluminum is put into a calorimeter (see sketch at right) that contains of water. The aluminum sample starts off

Gemiola [76]

Answer:

Specific heat capacity of aluminium is 0,863 J/g°C

Explanation:

Values: 250g of water, aluminum sample starts off at 91.3°C, water starts off at 16.0°C, temperature of the water stops changing it's 19.5°C

In this problem, the heat produced for the aluminium is the same consumed by water. The heat consumed by water is:

Q = C×m×ΔT (1)

Where C is specific heat of water (4,184J/g°C), m is mass of water (250,0g) and ΔT is change in temperature of water (19,5°C-16,0°C = 3,5°C)

Replacing:

Q = 4,184J/g°C×250,0g×3,5°C

Q = 3661 J

Using (1), it is possible to obtain specific heat of aluminium, thus:

Q / (m×ΔT) = C

Where Q is heat (3661J), m is mass (59,1g) and ΔT is change in temperature (91,3°C - 19,5°C( = 71,8°C

Replacing:

3661J / (59,1g×71,8°C) = C

C = 0,863 J/g°C

I hope it helps!

4 0

4 years ago

The reaction N2O4â†½âˆ’âˆ’â‡€2NO2 is allowed to reach equilibrium in a chloroform solution at 25 âˆ˜C . The equilibrium concentr

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Learn more about anxiety here:
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2 years ago

The electron cloud of HF is smaller than that of F2, however, HF has a much higher boiling point than F2 has. Which of the follo

mafiozo [28]

Answer:D

Explanation:

The high boiling point of HF is not attributable to the dispersion forces mentioned in the question. In HF, a stronger attraction is in operation, that is hydrogen bonding. This ultimately accounts for the high boiling point and not solely the dispersion model as in F2.

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3 years ago

Properties such as luster, conductivity, and flexibility are used to describe what type of elements

sineoko [7]

Metals
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3 years ago