Answer:
selenium, Se
Explanation:
Selenium is the only element that has a melting point below 525 K. Therefore, it would be the only element that would be liquid at that temperature.
At 525 K, only bismuth would be in the liquid phase as its melting point is 544.7 K and boiling point is 1837 K, while all other elements would be in the solid state.
The question asks about the phase of different elements at a specific temperature of 525 K. To answer the question, we need to know the melting and boiling points of these elements: platinum (Pt), selenium (Se), bismuth (Bi), copper (Cu), and calcium (Ca).
At 525 K, bismuth (Bi) would be in the liquid state as its melting point is 544.7 K and boiling point is 1837 K. All other elements mentioned have melting points and boiling points higher than 525 K, so they would be in the solid state.
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The mass of the solution of sugar and water is 120 grams.
Mass is the quantity of matter of a physical body.
The mass of the sugar is given is 20g
The mass of the water is 100 g.
100 + 20 = 120 gram
Thus, the mass of the solution of sugar and water is 120 grams.
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a. 8
b.16
c.32
d.64
32 Electrons
In statement the letter "n" specifies the Principle Quantum Number. Principle Quantum number is main energy level of an atom. Hence, n = 4 means we are talking about the fourth energy level or fourth shell of an atom.
Also, the number of electrons present in any main energy level are calculated by using following formula,
2n²
Hence, as,
n = 4
So, by putting this value in above formula,
2 (4)²
2 (16)
32
The maximum number of electrons that can be accommodated in the n=4 shell is 32.
(Option C).
The maximum number of electrons that can be accommodated in the n=4 shell can be determined using the following formula.
maximum electrons = 2n²
where;
The given parameters include;
n = 4
The maximum number of electrons that can be accommodated in the n=4 shell is calculated as;
maximum electrons = 2n²
maximum electrons = 2 (4²)
maximum electrons = 32
Learn more about maximum electron in shell here: brainly.com/question/4177923
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An atom of sodium, with an atomic number of 11, has 11 protons and 11 electrons. The atomic number is indicative of both the number of protons in an atom and, in a neutral atom, the number of electrons.
The atomic number of an element corresponds to the number of protons in the nucleus of its atom. So, an atom of sodium whose atomic number is 11 has 11 protons. As the atom is neutral, it also means that the atom will have 11 electrons to balance the 11 positive charges of the protons. This information can be found on the periodic table, which gives the atomic number and the atomic mass of each element.
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