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irga5000 [103]
3 years ago
7

An atom that has 13 protons and 15 neutrons is an isotope of the element? How can I count it?

Chemistry
1 answer:
Diano4ka-milaya [45]3 years ago
7 0
It's simple.
the number of protons in an atom never changes. And also, the no of protons is its atomic number.if you look up the periodic table, you will find a number on the top - left corner of each of the boxes. This is the atomic number.No 2 same elements on the periodic table have the same atomic number. So, all you have to do is search for a box that has the number 13 on it.

and by the way ... the element which you're searching for is Aluminium
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How many grams of calcium chloride are needed to produce 1.50 g of potassium chloride? cacl2(aq) + k2co3(aq) → 2 kcl(aq) + caco3
Virty [35]
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Hope it helps :)
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Answer:

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So the correct answers are

2. A person's income and expenses are equal every month.

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shusha [124]
Analyze the Name of complex Compound.

                              T<span>etracarbonylplatinum(iv) chloride

So, there are,
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In complexes positive part is always named first, so the sphere containing Pt and carbonyl ligands is written first,

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The charge on sphere is +4 because CO ligand is neutral, and Pt has a Oxidation state of four as written in name (IV),
So,
                                             [Pt (CO)₄]⁴⁺

Now, in order to neutralize +4 charge we should add 4 Chloride ions, So,

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4 0
3 years ago
Calculate the decrease in temperature when 7.00 L at 21.5 °C is compressed to 4.00 L. The pressure remains constant at 101.3 kPa
ivolga24 [154]

Explanation:

\frac{P _{1} V _{1} }{T _{2}}  =  \frac{P _{2} V _{2}}{T _{1}}  \\  \frac{(101300 \times 7)}{(21.5 + 273)}  =  \frac{(101300 \times 4)}{T _{2}}  \\ T _{2} =  \frac{(405200 \times 294.5)}{(709100)}  \\ T _{2} = 168.3 \: kelvin \\ decrease \: in \: temperature = (294.5 - 168.3) \\  = 126.2 \: kelvin

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3 years ago
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