The compact, positively-charged nucleus of an atom contains two main types of subatomic particles: protons and neutrons. Orbiting the atom's nucleus are negatively-charged subatomic particles called electrons. The mass of an atom is concentrated in the nucleus.Know More
The three primary subatomic particles that constitute matter include neutrons, protons and electrons. Protons carry positive charges, electrons carry negative charges and neutrons are electrically neutral. The net positive charge of the nucleus is the result of the positively-charged protons within the central core. Protons and neutrons are almost identical in mass while electrons are so light that their masses are sometimes considered negligible.
A chemical element is composed of the same type of atoms. An atom of a particular element retains all the chemical properties of that element. In a periodic table, an element is characterized by an atomic symbol, atomic number and mass number. The elements are organized in increasing order of atomic numbers, since the atomic number is unique to each element.
The atomic number indicates the number of protons present in the nucleus, which is also equal to the number of electrons in a neutral atom. The mass number refers to the total number of protons and neutrons in the nucleus. While all atoms of an element are identified by the same atomic number, this is not always the case for the mass number. One form of atom, known as an isotope, contain the same number of protons but vary in the number of neutrons.Learn more about Atoms & Molecules
Carbon has six protons in its nucleus, so its atomic number is six. It also has six neutrons in its nucleus and typically has six electrons as well.Full Answer >
The atomic number of nickel is 28, which means that it has 28 protons in its nucleus. It also has 28 electrons and 31 neutrons.Full Answer >
The first ionization energy generally decreases down a group due to the increasing distance of the valence electrons from the nucleus of an atom. The increasing gap lowers the attractive force of the protons that pull the electrons closer to the nucleus.Full Answer >
The term "atomic radius" refers to the measured distance between the nucleus of an atom and the furthest orbiting electron. The outermost electron is referred to as a valance electron. The effective nuclear charge of an atom directly affects the size of the atom and the atomic radius.Full Answer >