Protons.
Atoms can have a different amount of neutrons, but the protons are always the same. Around the outside of the atom there are tiny particles called electrons. Electrons move constantly. Each electron has a negative electrical charge. Electrons can move away from the atom sometimes. They can be shared between atoms, or they can go from one atom to another. Electrons can even move through matter, which is what causes electricity.
In the center of the atom (the nucleus) are the bigger, heavier parts of the atom. There are two types of particle in the nucleus. One of them is the neutron, a particle with no charge. The other type of particle is the proton, a particle with a positive charge.
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Lead-209 will be left over after the isotope bismuth-213 undergoes alpha decay, as the emission of an alpha particle causes the atomic number of the element to decrease by 2. Bismuth-213 has an atomic number of 83, so after the emission of an alpha particle (which has an atomic number of 2), the resulting element will have an atomic number of 81, which corresponds to lead.
Potassium is an element. Elements are pure substances. They don't "contain" anything.
The atomic number indicates the number of protons in an atom of a particular element. The atomic number must be an integer (counting number), and is unique to that specific element.
Protons are the subatomic particles represented by the atomic number of an element. The atomic number is equal to the number of protons in the nucleus of an atom, which determines the element's identity on the periodic table.
The number of protons defines the element.
protons, no. of protons is equal to the atomic number of an element.
All atomic nuclei contain protons (hydrogen has only one). The number of protons in the nucleus determines which element it forms, this is called the atomic number
This particle is the proton, equal to the atomic number.
The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. For example, all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1. All carbon atoms, and only carbon atoms, contain six protons and have an atomic number of 6. Oxygen atoms contain 8 protons and have an atomic number of 8. The atomic number of an element never changes, meaning that the number of protons in the nucleus of every atom in an element is always the same.
Proton
The number of neutrons.
The element with atomic structure similar to an alpha particle is helium. An alpha particle consists of two protons and two neutrons, the same as the nucleus of a helium atom.
The number of protons in the atomic nucleus determines what element it is. Each element has a unique number of protons, known as its atomic number.
The atomic number of an element is equal to the number of protons contained in the atomic nucleus.
Atomic number is the number of protons in the atoms of a particular element. Each element has its own unique atomic number.
The atomic number is the number of protons in the atomic nucleus of a particular element. Each element has its own unique atomic number.