Atomic Mass

The atomic mass of sodium is approximately 23 grams per mole.

Phosphorus (P) - 15, Sodium (S) - 16, Chlorine (Cl) - 17, Argon (Ar) - 18 and Potassium (K) - 19.

The atomic number of chlorine is 17, which means it has 17 protons in its nucleus. The atomic mass of chlorine is approximately 35.5 atomic mass units, taking into account the average of its isotopes.

The element with an atomic mass of 34.453 is sulfur (S).

The atomic mass of benzene, C6H6, is approximately 78.11 g/mol. This is calculated by adding the atomic masses of the six carbon atoms (12.01 g/mol each) and six hydrogen atoms (1.01 g/mol each) that make up the molecule.

Gallium is a non metal element. Atomic mass of it is 69.723.

Statement C is not true. One mole of krypton atoms has a mass of approximately 83.798 g, not 41.90 g.

Chlorine gas is Cl2.

Cl's atomic mass is 35.45

and that x 2 is 70.9

Silver is a meta element. Atomic mass of it is 108.

The elements in the periodic table are arranged by atomic number, which represents the number of protons in an atom's nucleus. This arrangement creates groups and periods that help categorize elements based on their properties and characteristics. Additionally, elements with similar properties are placed in columns called groups.

Number of protons = atomic number = 6 atomic units

Number of protons + neutrons = mass number = 13 atomic units

Each isotope of each element has an atomic mass number. The atomic mass numbers for hydrogen are 1, 2 and 3. That's because hydrogen has three isotopes. "Regular" hydrogen has a single proton in its nucleus. It's atomic mass is 1. There is also heavy hydrogen, which has a neutron bound to the proton in its nucleus. It's atomic mass is 2. Heavy heavy hydrogen has two neutrons bound together with the proton. It's atomic mass is 3. A link is provided to the Wikipedia article on hydrogen.

The element with atomic mass 74.922 is Selenium, with atomic number 34. It is a nonmetal with various applications in industry and technology, particularly in solar cells and glass production.

Radon, unless you count the synthetic Ununoctium. But because it is radioactive, highly unstable, and synthetic, I would discount it for now. It does however have the largest atomic mass for any known atomic substance. So, the answer is Radon.

The average atomic mass is included in the periodic table because elements exist as a mix of isotopes with different atomic masses. The average atomic mass accounts for the abundance of each isotope in nature, providing a more accurate representation of the actual mass of an element in a given sample.

Francium has a greater atomic mass than potassium. Francium has an atomic mass of around 223 u while potassium has an atomic mass of around 39 u.

No, an atom's atomic mass is the sum of the total number of protons and neutrons in its nucleus. Electrons have such a tiny mass that they are usually not included in the calculation of an atom's atomic mass.

Dmitri Mendeleev, a Russian chemist, was the first to notice that the properties of elements seemed to repeat periodically when arranged in order of increasing atomic mass. He created the first version of the periodic table based on this observation in 1869.

Copper is a meta element. Atomic mass of it is 64.

The atomic mass was first calculated by chemist Joseph Louis Proust in the late 18th century by comparing the weights of different elements in chemical reactions. This pioneering work laid the foundation for the development of the modern atomic mass scale, which is now based on the carbon-12 isotope as the standard reference.

Atomic mass is a weighted average of the masses of an element's isotopes, taking into account the abundance of each isotope in nature. It is a combination of the number of protons and neutrons in the nucleus of an atom.

the elements in the substance are mixtures of their isotopes

The element with 58 electrons is Cerium (Ce). It has the atomic number 58. Cerium is a 'Rare Earth' metal in Period 6 (Lanthanide group) of the periodic table.

With mass number 140 this Ce is the first and stable isotope (142 is weakly unstable, 141 is a radioactive artificial isotope)

[It has 58 electrons in 6 shells with 2 electrons in the outer shell (4f-block), so it is NOT a 'Transition' group metal of the 5d-block starting with 72Hf]

The periodic table was first organized by atomic mass. However, after the discovery of isotopes and inconsistencies around this method, it was later rearranged based on atomic number, which reflects the number of protons in an atom's nucleus.