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(2) equal to the total number of protons gained
(3) less than the total number of electrons gained
(4) less than the total number of protons gained
Answer is: (1) equal to the total number of electrons gained.
In oxido-reduction reaction, at least one element lose and one element gain electrons.
Oxidation reaction is increasing of oxidation number of atom, because element lost electrons in chemical reaction.
Reduction is lowering oxidation number because atom gain electrons.
For example, in oxidation-reduction reaction: 2H₂ + O₂ → 2H₂O; hydrogen is oxidized (change oxidation number from 0 to +1) and oxygen i s reduced (change oxidation number from 0 to -2).
Hydrogen lost .four electrons anf oxygen gain four electrons
The atomic mass of an element is calculated using its masses and the ratios of its naturally occurring isotopes. The answer is number 3. The rest of the choices do not answer the question above.
Answer:
#3
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Answer:
The atomic mass is the weighted average of all the naturally occurring isotopes of the element.
Explanation:
A. The atomic mass is the weighted average of all the naturally occurring isotopes of the element. YES. Since there can be several different isotopes of the same element, the weighted average is used in the periodic table to reflect the likely composition of a random sample.
B. The atomic mass is determined by the number of protons in the nucleus. NO
C. The atomic mass is a whole number, but it appears as a fraction due to rounding in the periodic table. NO.
D. The atomic mass is a decimal number because it represents the total number of electrons in the atom. NO.
Energy emitted from stars is the result of fusion.
Fusion is a process where two or more atoms combined together to form a new molecule.
As in the question it is stated that Luminosity is the amount of energy emitted by a star each second is true, because of the fusion of hydrogen atoms to helium atom and high amount of energy is released in the form of light. And Stars radiate light over a broad range of frequencies in the electromagnetic spectrum, from the low energy radio waves to high energy gamma rays.
Hence, due to fusion energy is emitted from stars in the luminous.
To learn more about fusion, visit below link:
brainly.com/question/890176