It is an isotope, an example is hydrogen and deuterium.
istope
Isotopes have different numbers of electrons, but not different atomic numbers (numbers of protons) or they'd be different elements.
Atomic number = number of a chemical element in the periodic table of Mendeleev = number of protons in the nucleus = number of electrons in the atom
Atomic number is the number of protons in an atom, not the number of atoms. The element with the atomic number 15 is phosphorus.
Each isotope of an element has an atomic mass. The average of all the atomic masses of an element's isotopes gives an elements atomic weight. For this reason, atomic weights are decimal numbers.
No. The element's atomic number determines how it forms compounds.
Agate is not an element, so it has no specific atomic number. Agate is a specialized crystalline form of silicon.
The atomic number is the number of protons found in the nucleus of an atom.Also, if in it's pure elemental form, the number of electrons.
Elements can exist in the form of different isotopes. Isotopes of the same element have the same number of protons in their nuclei but have different numbers of neutrons. The first gives them the same atomic number and chemical properties while the second gives them different atomic weights.
An element can have a number of isotopes with different atomic mass but will always have the same atomic number. Some elements can also form two or more allotropes that can have different molecular formulas, for example oxygen can be O2 or O3.
The atomic number represents the number of protons in the nucleusNumber of protons in nucleus.Number of electrons in the clouds around the nucleus (when not ionized).
Atomic mass is the sum of the number of protons and neutrons in the nucleus. The reason it is typically found in decimal form is because it is using the average number of neutrons, from all the different isotopes of that element.