The SI unit used to measure mass is said to be option A: kilogram (kg).
The kilogram (kg) is the standard unit used to measure mass. The kilogram is the main unit used to measure how heavy something is in the International System of Units. It is based on the weight of a special cylinder made of platinum and iridium called the International Prototype of the Kilogram.
The liter (b.) is the SI unit for volume, the meter (c.) is the SI unit for length, and the Kelvin (d.) is the SI unit for temperature. The kilogram is commonly used as a standard unit for measuring weight in science, industry, and everyday situations.
Hence option A is correct.
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Which of the following is the SI unit used to measure mass? a.
kilogram
b.
liter
c.
meter
d.
Kelvin
Answer:
an element is a pure substance
Explanation:
Protons: 11 - Neutrons: 12 - Electrons: 11. By analyzing the atomic number, mass number, and net charge, we can determine the number of protons, neutrons, and electrons in the sodium-23 atom.
The sodium-23 atom (Na-23) has a net charge of +1, which means it has one more proton than electrons. To determine the number of protons, neutrons, and electrons in the atom, we need to look at its atomic number and mass number.
The atomic number of an element represents the number of protons in its nucleus. Since the net charge of the sodium-23 atom is +1, it means there is one more proton than electrons. Therefore, the number of protons in the sodium-23 atom is 11.
The mass number of an atom is the sum of its protons and neutrons. To find the number of neutrons, we subtract the number of protons (atomic number) from the mass number. In this case, the sodium-23 atom has a mass number of 23, and since it has 11 protons, we can calculate the number of neutrons:
Mass number - Atomic number = Number of neutrons
23 - 11 = 12 neutrons
Lastly, to find the number of electrons, we need to consider the net charge. Since the sodium-23 atom has a net charge of +1, it means it is missing one electron to become neutral. Therefore, the number of electrons in the sodium-23 atom is 11.
In summary:
- Protons: 11
- Neutrons: 12
- Electrons: 11
By analyzing the atomic number, mass number, and net charge, we can determine the number of protons, neutrons, and electrons in the sodium-23 atom.
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Answer:
It is less dense than air so it will help the airship float, and it is not flammable so the airship is less likely to catch on fire. None of the other noble gases have similar or better reasons.
Explanation:
Answer:
Some elements are abbreviated with more than two letters such as the Ununtrium (Uut), Ununpentium (Uup), Ununseptum (Uus) and Ununoctio (Uuo).
Explanation:
Some elements have intuitive symbology, such as Chlorine (Cl), among others, which are represented by the first letters that make up the name. However, there are others who receive symbols that do not remember the name of the element, such as Lead (Pb). Regardless of the similarity between the names and the symbol of the elements, most of them have the symbol composed of one or two letters, except for the elements Ununtrium (Uut), Ununpentium (Uup), Ununseptum (Uus) and Ununoctio (Uuo).