Answer:D
Explanation:
Number of electrons=Number of protons
Sodium atom has 1 valence electron
Answer:
See detailed explanation.
Explanation:
Hello.
In this case, since the electron configuration of potassium whose atomic number is 19 turns out:
We can see that the last level is 4 which has one electron, meaning that potassium has one valence electron. Moreover, since bromine's atomic number is 35, its electron configuration is:
We can see that the last level is also 4 and it has 2+5 = 7 valence electrons. In such a way, we infer that the valence electrons are computed by the electrons at the outer or last energy level of an element.
Regards.
Explanation:
Mass of solution , m= 0.94 g + 215 g = 215.94 g
Volume of the solution = V
Density of solution = d =
Moles of hydrogen =
Molarity of hydrogen gas:
Molality of hydrogen gas :
Mass of solvent or here it is palladium = 215 g =0.215 kg (1 g = 0.001 kg)
Mass percentage of hydrogen is solution :
Answer: How do contrasting colors affect the quality of a painting?
Explanation:
The object study of science is objective phenomena, which are those phenomena that can be measured in a form that every ones agree because they do not depend on the particular subject that is involved in the study.
Color of light, mating behaviors of bees, soil pH, the productivity of fruit trees, temperature, and the amount of oxygen able to dissolve in water are variables or characteristics that can be objectively measured, so they can be perfectly object of study of and answered by science.
On the other hand, the ability to contrast color and the quality of paintings are characteristic that are subjective: they depend on the subject that assess such properties. This makes that a question like "How do contrasting colors affect the quality of a painting?" cannot be answered by science.
Answer:
<u>It increases by a factor of four</u>
Explanation:
Boyle's Law : At constant temperature , the volume of fixed mass of a gas is inversely proportional to its pressure.
pV = K.......(1)
pV = constant
Charles law : The volume of the gas is directly proportional to temperature at constant pressure.
V = KT
or V/T = K = constant ....(2)
Applying equation (1) and (2)
According to question ,
T2 = 4 (T1)
V2 = V1
Put the value of T2 and V2 , The P2 can be calculated,
V1 and V1 cancel each other
T1 and T1 cancel each other
We get,
or
P2 = 4 P1
So pressure increased by the factor of four