what elements are considered a diatomic element?

Is 1s22s22p6 the symbol for a macroscopic property or a microscopic property of an element? Explain your answer.

A scientist thinks that they have discovered a new element. What characteristics must the substance have in order to be classified as an element?

is chlorine gas an element ?

List the seven diatomic elements. Give their names and symbols.

Defend or refute the statement • The separation of a mixture may result in the production of an element

The element symbol for nickel is

What is the chemical symbol of the element found in the 4th family and 5th period of the periodic table?

Naturally occurring uranium consists of two isotopes, whose masses are shown below: Isotope Mass U-235 235.044 amu U-238 238.051 amu U-238 is naturally the most abundant form of uranium; however, only U-235 can be used as fuel in a nuclear reactor, so uranium for us in the nuclear industry must be enriched in this isotope. If a sample of enriched uranium has an atomic weight of 235.684 amu, what percentage of U-235 is present?

A hypothetical element, X, has two isotopes: 47X with an isotopic mass of 47.621 amu and 51X with an isotopic mass of 51.217 amu. Eight of every twenty-four atoms of X found in nature exist as the 47X isotope. What is the average atomic mass of the element X?