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 >
Moving across periods on the periodic table from left to right, the atoms tend decrease in radius size because each atom has more protons than the atom before it, meaning there is more of an attractive force in the nucleus that pulls the electrons closer to the center. Even though there are both more protons and electrons, the attractive force of the protons wins out and makes the radius of the entire atom smaller.Full Answer >
The atomic number of an atom represents the number of protons found in the nucleus of that atom. Elements are identified by their atomic numbers because each element has a different number of protons in its nucleus.Full Answer >