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miss Akunina [59]
2 years ago
11

isotopes of an element will always have the same a. number of protons. b. number of neutrons. c. number of electrons. d. mass.

Chemistry
1 answer:
Nastasia [14]2 years ago
3 0
Your answer is same number of protons
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Write each element and elements of atoms of the compound Na2PO3F
Rudik [331]

The subscripts tell you <em>how many atoms</em> of an element are in one formula unit of a compound.

If there is no subscript, there is only one atom of the element.

In one formula unit of Na₂PO₃F, there are

Two atoms of sodium (Na)

One atom of phosphorus (P)

Three atoms of oxygen (O)

One atom of fluorine (F)

7 0
3 years ago
Aluminum–lithium (Al–Li) alloys have been developed by the aircraft industry to reduce the weight and improve the performance of
brilliants [131]

Answer:

6.54% is the required concentration of lithium in an alloy (Al–Li).

Explanation:

Suppose 100 grams of an alloy of aluminium and lithium.

Density of an alloy = d  2.14 g/cm^3

Volume of an alloy = V

V=\frac{100 g}{2.14 g/cm^3}=46.73 cm^3

Volume of aluminum = v_1

Mass of aluminum = x

Density of aluminum = d_1=2.71 g/cm^3

v_1=\frac{x}{d_1}

Volume of lithium = v_2

Mass of lithium = y

Density of lithium= d_2=0.534 g/cm^3

v_2=\frac{y}{d_2}

x+y=100 ..[1]

v_1+v_2=V

\frac{x}{d_1}+\frac{y}{d_2}=46.73 cm^3

\frac{x}{2.71}+\frac{y}{0.534}=46.73..[2]

Solving [1] and [2] :

we get :

x = 93.46 g

y = 6.54 g

Concentration of Li (in wt%) that is required:

Li\%=\frac{6.54 g}{100 g}\times 100=6.54\%

5 0
3 years ago
What is the only part of an atom that cannot change (either protons, neutrons, or electrons)?
d1i1m1o1n [39]
The number of protons never changes in an atom. More electrons means a negative charge and fewer means a positive charge. Once an atom has an electrical charge it is called an ion. In an ion the atomic number and atomic mass do not change from the original.
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salantis [7]

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Explanation:

6 0
3 years ago
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For an atom’s electrons, how many energy sublevels are present in the principal energy level n = 4? 4 9 10 16 32
Ghella [55]
I believe the answer is 32.
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3 years ago
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