What is the vocabulary for atomic number?
Scientists use the term atomic number to describe the number of protons in one atom of an element. For example, the atomic number of hydrogen is 1. If you’ve ever taken a chemistry class, you’ve seen a chart called “the periodic table of elements.” It lists every chemical element and each element’s atomic number.
What is the vocabulary for atomic mass?
Use the noun atomic mass when you’re talking about the mass of an atom’s protons, neutrons, and electrons. You’ll come across the term atomic mass if you study chemistry, in which it refers to a single atom of some chemical and the total mass of that atom. The unit of measurement is an “atomic mass unit” or amu.
What is an atomic number definition for kids?
Kids Encyclopedia Facts. The atomic number (symbol: Z) of an atom is the number of protons in the nucleus of the atom. The atomic number of an atom identifies which element it is. In a neutral atom, the atomic number is equal to the number of electrons orbiting the nucleus.
What is the definition of atomic number with example?
The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. Atomic number = Number of protons. For example, in a sodium atom, there are 11 electrons and 11 protons.
What is the vocabulary for element?
An element is something basic and important — in chemistry, an element is one of the essential molecules that everything else is made of. If a book’s ending carries an “element of surprise,” it means surprise is an important part of the story’s end.
What is matter vocab?
Matter is everywhere: anything that has mass and takes up space is matter.
What is a sentence for atomic number?
The amount of energy that individual atoms absorb depends on their atomic number. For example, all carbon atoms contain 6 protons in their atomic nucleus; so the atomic number of carbon is 6.
What is another name for the 4 elements?
Empedocles was the first to propose four elements, fire, earth, air, and water. He called them the four “roots” (ῥιζώματα, rhizōmata).
What is the vocabulary of molecule?
A molecule is the simplest structural unit of a substance that still keeps the properties of that substance, like a molecule of water. This scientific word also gets used in unscientific ways, as in “Every single molecule in my body wants that chocolate cupcake!”