Answer: alkaline earth metals (group-IIA)
Explanation:
The element which donates the electron is known as electropositive element and forms a positively charged ion called as cation. The element which accepts the electrons is known as electronegative element and forms a negatively charged ion called as anion.
Alkaline earth metals donate 2 valence electrons to acquire noble gas configuration.
For example: Berrylium is the first alkaline earth metal with atomic number of 4 and thus has 4 electrons
Electronic configuration of berrylium:
Berrylium atom will loose two electrons to gain noble gas configuration and form berrylium cation with +2 charge.
Thus Elements donate 2 electron to produce a cation with a 2+ charge are alkaline earth metals.
Take two plants - ensure that both get the same amount of sunlight, but one will get little water and the other more water. Water would be the manipulated variable; the sun would be the independent variable and there is only one control. (1) make an observation; “water makes plants grow.” (2) draft the hypothesis “...if____ the ____.” (3) conduct the experiment; (4) gather the data; (5) Do the analysis to support or deny your hypothesis; and (6) repeat if necessary.
Answer:
One or more number of species which have same number of atomic number but different mass number are called isotopes.
For example, are the isotopes of hydrogen.
So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.
Complete Question
The complete question is shown on the first uploaded image
Answer:
The concentration of high-pressure side is
Explanation:
From the question we are told that
The thickness of the polyethylene is
The temperature is
The flux is
The concentration on the low-pressure side is
The initial diffusivity is
The activation energy for diffusion is
Generally the diffusivity of the oxygen at 600 K can be mathematically evaluated as
substituting values
Generally the flux is mathematically represented as
Where is the concentration of oxygen at the higher side
So
substituting values
Answer : The partial pressure of X and Y gases are, 0.525 and 1.575 atm respectively.
Explanation : Given,
Moles of X = 2.0 mole
Moles of Y = 6.0 mole
Total pressure = 2.1 atm
Now we have to calculate the mole fraction of X and Y.
and,
Now we have to calculate the partial pressure of X and Y.
According to the Raoult's law,
where,
= partial pressure of gas
= total pressure of gas = 2.1 atm
= mole fraction of gas
and,
Thus, the partial pressure of X and Y gases are, 0.525 and 1.575 atm respectively.