1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
melomori [17]
3 years ago
10

The answers please, I can't figure it out. please send the answers to the chart.

Chemistry
1 answer:
VladimirAG [237]3 years ago
5 0
This is actually really is. Notice how the protons + the neutrons equal the top number next to the element and the bottom one is the amount of protons. 

So for Rn, it already gives you the protons and the atomic number (the top number), you just subtract them ---> 209-86= 123 neutrons.

I don't have a periodic table to look at, but for the next one just add the protons and the neutrons to get the atomic number (the atomic number will be under the element symbol) and look for it on the periodic table to find the element and so on. 

I hope this helps ♥
You might be interested in
How many milliliters of sodium metal, with a density of 0.97 g/mL, would be needed to produce 53.2 grams of hydrogen gas in the
olchik [2.2K]
The balanced chemical reaction is:

<span>2Na + 2H2O → 2NaOH + H2
</span><span>
We first use the amount of hydrogen gas to be produced and the molar mass of the hydrogen gas to determine the amount in moles to be produced. Then, we use the relation from the reaction to relate H2 to Na.

53.2 g H2 ( 1 mol / 2.02 g ) ( 2 mol Na / 1 mol H2 ) ( 22.99 g / 1 mol ) = 1210.96 g Na

1210.96 g Na ( 1 mL / 0.97 g ) = 1248.41 mL Na needed</span>
7 0
2 years ago
Which statement best describes a physical change?
Inga [223]

Answer:  3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same

Explanation:

Physical change mainly physical properties of a substance while the chemical changes remain unchanged. Once there is a change to the chemistry of the substance, this would be classified as a chemical change.

8 0
2 years ago
Read 2 more answers
Air pollution may have a greater effect on health than on atmospheric temperature.
worty [1.4K]
<span>Yes it is true, Because we are breath in air in the form of smoke and very small practical plagued our lungs, Which are very danger for our body. Computerized tomography imaging studies on the bodies of ancient mummies have detected evidence of pneumonia, emphysema and many types of asthma problem occur in our body .</span>
8 0
3 years ago
Helpppp<br> pleasee!!!!! :)
frez [133]
Weight cost toxicity
4 0
3 years ago
Read 2 more answers
In an experiment, shinning which type of light on a strip of metal would be least likely to produce the photoelectric effect?
user100 [1]

C red light isn't an efficient source of light

5 0
3 years ago
Read 2 more answers
Other questions:
  • In general, which of the following statements about electron-pair geometries is true?
    12·1 answer
  • What is the nuclear binding energy of an atom that has a mass defect of 1.643 x 10-28kg?
    14·2 answers
  • Give the number of significant figures in this number: 40
    7·2 answers
  • 10Al + 6NH4ClO4 → 4Al 2O3 + 2AlCl 3 + 12H2O + 3N2
    8·1 answer
  • A student writes the following explanation of how certain molecules are formed.A process is used to chemically link smaller unit
    15·1 answer
  • Please help some one I’ve been trying this all day and it’s due in 5 min
    11·1 answer
  • An object has a density of 10.00 g/mL. If the object has a volume of<br> 25.00 ml, what is the mass?
    13·1 answer
  • DUE IN 30 MINUTES!!! (please keep it short if you can, if not its ok.) What is the molar mass of Pb(SO4)2? Explain how you calcu
    5·2 answers
  • Predict the shape of the molecule....
    15·1 answer
  • Draw lewis formula and structural formula of hydrogen ion please and thank you
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!