explained isotopes: They differ in mass because they have different numbers of neutrons, but they are chemically identical because they have the same number of
Atoms of one element differ in properties from atoms of all other elements – Atoms combine in simple, whole-number ratios to form compounds
A substance made up of 2 or more different elements whose atoms are chemically bonded Symbol or Formula Type of Matter ELEMENT
We now know that atoms are composed of smaller particles of matter, and that atoms of a given element can show small differences among themselves The second
ABSTRACT: This work investigates the formation of particular student profiles based on of their ideas relating to basic characteristics of the atom
Compound: more than one kind of atom in a Atoms are conserved in chemical and physical different number of neutrons from another atom
Note: This is the ONLY structural difference between an atom and an ion An ion has a different number of electrons than protons An atom always has the same
An atom is the smallest unit of a chemical element Atoms of different elements (as determined by chemical interactions) also differ in their masses
Sometimes an atom has less neutrons or more neutrons than protons This is called an isotope If an atom has different numbers of electrons
Differences in the concentration of sodium and potassium inside and outside of cells allow your nerve and muscle fibers to send electrical
These established that atoms can be further divided into sub- atomic particles, i e , electrons, protons and neutrons— a concept very different from that of Dalton
nucleus of the cell that gives each cell in your body its shape and function 3 But how did themselves In this way, cells are different from atoms and molecules