aProtons and electrons are parts of atoms that make up all things in our world 氢核和电子是在我们的世界组成所有事原子的一部分[translate] a你知道邮局在哪吗? Which do you know the post office in?[translate] aYOU KNOW I DON NOT CARE 您知道不是I唐关心[translate] ...
Everything in the world is made of atoms (原子). Atoms are small. You can fit millions of them on the head of a pin. In every atom, there are electrons (电子), protons (质子) and neutrons (中子). In some atoms, it is possible to move electrons easily from one atom to anothe...
Why is it important for scientists to make precise and accurate measurements? Explain why elements that are in the same group of the Periodic Table tend to show similar chemical behavior. How do we know that matter is composed of atoms?
Chapter 17 Can we get those electrons moving? Induction The transfer of electron or electricity without touching A group of cells put together BATTERy A group of cells put together Electric Discharge The release of electricity from a source – like a cumulonimbus cloud Static electricity Electric ch...
The pressure is high enough to force atoms of hydrogen to come together in nuclear fusion reactions — something we try to emulate here on Earth. Two atoms of hydrogen are combined to create helium-4 and energy in several steps: Two protons combine to form a deuterium atom (hydrogen atom ...
Purity of a Substance: A chemical element is one that contains only atoms that are identical to each other in their atomic number, i.e., the number of protons. If they have atoms of other elements alongside it, then the substance is said to be impure. Mining operati...
Its 112 protons make copernicium the heaviest known element with a name. It was first observed by Sigurd Hofmanna scientist in Germany. In 1996, Hofmann and his team had to figure out a way to get all theprotons together and stick. T hey used a machine that can speed up atoms up to ...
Chemical bonds are the forces that hold the atoms together in a molecule: These forces are of various types. So, one can have metallic bonds, ionic bonds, and covalent bonds. The strengths of the bonds are different and ...
How do cations and anions gain or lose protons and electrons? Can hydrogen be a negative ion? H_2S and H_2O have similar structures and their central atoms belong to the same group. Yet H_2S is a gas at room temperature and H_2...
or the presence of nearby molecular clutter that gets in the way of a nucleophile weasling its way in to attack the carbon. At the extremes, a carbon that has three other carbon atoms attached to it is too hindered for SN2 (below right). In an opposite scenario, a carbon with three ...