WebSep 24, 2024 · Mass is the amount of matter or substance that makes up an object. The units of measurement used to express mass are called kilograms (abbreviated kg). Whether you're on the moon or Earth, your ... Webproton, stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10−27 kg, which is 1,836 times the mass of an electron. Protons, together with electrically neutral particles called neutrons, make up all atomic nuclei except for the hydrogen nucleus (which consists of a single proton). Every …

Mole Definition, Number, & Facts Britannica

WebThe atomic number of a sodium atom is 11 and its mass number is 23. Calculate the number of protons, neutrons and electrons it contains. ... Biology (Single Science) Business; Chemistry (Single ... WebMar 30, 2024 · cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete organism in itself, such as a … job for 14 year old online

Atomic number Definition & Facts Britannica

WebMay 13, 2014 · NCERT Solutions for Class 10 Biology; NCERT Solutions for Class 10 Physics; ... Define mass number. ... Answer T he sum of the total number of protons and neutrons present in the nucleus of an atom is called the mass number. Answered by 13 May, 2014, 05:04: PM ... Weboverall. For example, the atomic number of chlorine is 17. Every chlorine atom has 17 protons and 17 electrons. It has 17 positive charges and 17 negative charges, meaning that it is neutral overall. instrument to cut bone medical term