What element has 1 proton, 0 neutrons, and 0 electrons? What is its mass number? What is its charge? What does the nucleus of an atom consist of? Which of the following has the largest mass? A. an electron B. a proton C. a neutron D. 1/2 an atomic mass unit (amu) E. 1.34...
Which element has an atomic number of 79? Which element has an atomic number of 1? Which element has the atomic number 43? Which element has an atomic number of 8? Which element has atomic number 20? Which element has atomic number 19? Which element has atomic number 2? Which element h...
Proton The primary contributor to an element's atomic number. Carbon, with six protons, has an atomic number of six. 3 Electrons Light particles with negligible contribution to atomic mass. The mass of electrons is often ignored in atomic mass calculations. 6 Proton A heavy constituent of the...
element vs. compound Anelementis a substance that cannot be separated into simpler substances by chemical means. An element consists of anatomwith a unique combination ofprotons,neutrons, andelectrons. For example, the element hydrogen has one proton, one neutron, and one electron. We cannot use ...
In any atom, like charges repel one another, and opposite charges attract one another. This is why two protons repel each other and so do two electrons, but a proton and an electron attract each other. In an element, the numbers of electrons and protons are equal. Moreover, since they...
Every atom must have at least one proton in it. The number of protons in an atom is important, because it defines what chemical element the atom represents. For example, an atom with just one proton is hydrogen, an atom with 29 protons is copper, and an atom with 94 protons is plutoni...
brought an understanding by the 1920s that the more fundamental property of an element’s atoms is their atomic numberZ– the proton count of their nuclei – which is the same for all atoms of a given element. Francis Aston discovered isotopes in 1922, which have the sameZbut different ato...
quantities during nuclear missile testing in the 20th century, but its half-life is about 12 years, meaning half of the quantity decays in that time frame. Scientists at ITER have proposed making tritium in large quantities by bombarding lithium, an element found in Earth's crust, with ...
Hydrogen is the lightest element because it consists simply of a single proton and sometimes a neutron (deuterium). Under certain conditions, it forms a solid metal, which has a density of 0.0763 g/cm3. This makes hydrogen the least dense metal, but it isn't generally considered a contender...
MALE PROFESSOR: Right.Well, early versions of the periodic table had gaps. Missing elements.Every time you have one more proton you have another element,and then — oops — there'd be an atomic number for which there was no known element.And the uh prediction was that an element with tha...