The atom is the smallest representative unit of a single chemical element and it contains some numbers of protons, neutrons and electrons. The number of protons for an element is fixed and represented by its atomic number. The number of neutrons can vary, which is the basis for isotope...
Write the symbol of oxygen. Try to do this without referring to a table of elements.问的是元素符号还是符号?我写O就OK了吗?How many protons (and electrons) are in an atom of lithium? 答案是3吗?
An atom of carbon-14 contains how many protons?Question:An atom of carbon-14 contains how many protons?Isotopes:Isotopes are chemical species or elements that have the same atomic number but a different mass number. Carbon is an element belonging to the p-block of the periodic table and carb...
When an unstable atom disintegrates, it produces particulate radiation, including alpha and beta particles. For example, when radioactive elements like uranium, radium and polonium decay, they release radioactive alpha particles. These particles, made up of protons and neutrons, are large and can ...
Each of its atoms has a nucleus with 92 protons and 143 neutrons. Fire a neutron at uranium-235 and you turn it into uranium-236: an unstable version of the same atom (a radioactive isotope of uranium) with 92 protons and 144 neutrons (remember that you fired an extra one in). ...
Auroras tell us many things about Earth's upper atmosphere, including its density, composition, flow speeds, and the strength of electrical currents flowing in the upper atmosphere. These in turn tell us about the Earth's magnetic field, how it extends into space, and how it changes dynamicall...
To be learned: How to sum charges in an atom (A)Atom Builder Low Embodied: This simulation served to remind players of the structure of an atom and how charge is measured. In the center of the screen was a slowly spinning nucleus (with protons in red and neutrons in yellow). The goa...
Atomic number:The number of protons in an atom's nucleus is referred to as the atomic number of that element. The number of protons defines what element it is and determines its chemical behavior. For example,carbon atomsalways have six protons;hydrogen atomsalways have one; andoxygen atomsalw...
PROBLEM TO BE SOLVED: To clarify what attraction is, to clarify magnitude of the attraction of a field where the big bang occurred, and to clarify how atoms were formed by an explosion of a mass of love of protons, if 4% of elementary particles in the space are matters that can be ...
The table has seven rows and 18 columns. Each row represents one period; the period number of an element indicates how many of its energy levels house electrons.Sodium,for instance, sits in the third period, which means a sodium atom typically has electrons in the first three energy levels....