When an element loses an electron(s) to form a cation there is a very very small decrease in mass When an anion is formed by gaining electron(s) there is a very small increase. A proton weighs roughly the same as a neutron and these are nearly 2000X the mass of an electron.
A small difference of mass exist because the gain or loss of electrons.
electrons
The atom loses mass when a beta particle is released because a neutron decays into a proton, electron, and antineutrino. The mass of the neutron is greater than the combined mass of the resulting proton, electron, and antineutrino.
The mass of an atom remains constant during a chemical reaction. According to the law of conservation of mass, mass cannot be created or destroyed, only rearranged. Therefore, the total mass of the atoms involved in a chemical reaction will remain the same before and after the reaction.
A negative ion would be considered larger than its parent atom. This is because electrons have mass, which makes the ions gain mass to outgrow their parent atoms.
No, an oxygen atom does not have twice the mass of a sulfur atom. An oxygen atom has a mass of approximately 16 atomic mass units (amu), while a sulfur atom has a mass of approximately 32 amu. Therefore, a sulfur atom has twice the mass of an oxygen atom.
The half-life of an atom is how long it takes for half of the atom's mass to radioactively decay. This occurs exponentially; therefore, after 2 of the atom's half-lives have passed, 3/4 of the atom will have decay (half during the first half-life, then half of the remaining mass, or one quarter, during the second).
A molecular ion is formed when a molecule gains or loses an electron, resulting in an ion with a net positive or negative charge. This can occur through processes such as electron impact ionization, chemical ionization, or electrospray ionization in mass spectrometry. The resulting molecular ion retains the same chemical formula as the neutral molecule but has a different charge.
The nucleus of an atom represents most of an atom's mass.
because some substances gain or loss weight during a reaction
The Hydrogen atom. Beware, Hydrogen has an atomic mass based on one proton, as it doesn't have a neutron. So Helium has a mass of four times Hydrogen.
The electrical charge is changed by -1 when an atom loses an electron. The atomic mass number is determined by the number of protons and neutrons in the nucleus and is unaffected by the loss of an electron.