Atoms of the same element with a different number of neutrons are known as

Dallol, Ethiopia, is one of the hottest places on Earth. From 1960 to 1966, its average annual temperature was measured and found to be 94.0 °F. Calculate Dallol’s annual average temperature during this time period in degrees Celsius.

What is the name given to elements that have some properties of metals and some of nonmetals?

The mass of 12C atom is exactly 12 u and there are 6.022 × 1023 u per gram. Using the correct number of significant figures, what is the mass of a 12C atom in grams?

Which are considered pure substances?

Calculate the volume in cubic centimeters of a rectangular box that is 4.69cm by 9.72 mm by 0.0521 m

The astronomical unit (au) is a unit of distance used in astronomy and is equivalent to the mean distance between Earth and the sun. One au is equal to 1.496 ×1011m. The closest Pluto and Earth get to each other during their orbits is approximately 28 au. How many kilometers is the distance between Earth and Pluto at this point?

What group of the periodic table is known as the alkaline earth metals?

Select the element that the chemical symbol W represents.

Approximate the atomic mass of a fictional element X with the following isotope data. ​ Isotope Abundance 45X 75.0% 47X 25.0% ​