Thus, the number of protons in an atom identifies it as an atom of a particular element. The number of protons in an atom is referred to as the atomic number. 因此,原子中的质子数决定了原子的种类。原子中的质子数等于其原子序数(元素序数)。 The
Not only does the ISS crew need to know their precise whereabouts, but they've also got to locate other objects — and figure out how to get from Point A to Point B, especially during reboosts. To discern its speed and location, the ISS uses Russian and U.S. global positioning systems...
Using a mass spectrometer, physicists have determined the mass of a hydrogen atom to be 1.660538921(73) × 10-27 kilograms, where the parenthetical digits are not known with complete certainty. That's accurate enough for most purposes. Good vibrations Another way that the mass of an atom can...
However, a camera's lens focuses light, while the lenses used in holography cause the beam to spread out. A beam splitter: This is a device that uses mirrors and prisms to split one beam of light into two beams. Mirrors: These direct the beams of light to the correct locations. Along...
Recognizing this, scientists defined the AMU in such a way as to make the conversion from microscopic to macroscopic quantities straightforward. The mass of an atom or molecule in AMU is equal to the mass of one mole of the atoms or molecules in grams. One gram is one one-thousandth of ...
How much energy can one atom make?A surprisingly large amount! That was what physicist Albert Einstein meant when he wrote out this simple and now famous equation:E = mc2If E is energy, m is mass (the scientific word for the ordinary stuff around us), and c is the speed of light, ...
How do you figure out the atomic number of an element?What element's atomic number is 45? a. Sc b. Rh c. Br d. MoWhat element has the atomic number 01?What is the name of the element that has an atomic number of 35?How many elements are on the periodic table of ...
It is not uncommon for a cosmic ray to collide with an atom in the upper atmosphere, creating a secondary cosmic ray in the form of an energetic neutron, and for these energetic neutrons to collide with nitrogen atoms. When the neutron collides, a nitrogen-14 (seven protons, seven neutrons...
When an atom emits an alpha particle, then the atomic number will be decreased by two amu and atomic mass by four amu. There are 2 protons, 2...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our expert...
To determine how many electrons are present in an atom with an atomic number of 20 and a mass number of 42, we can follow these steps: 1. Understand the Atomic Number: The atomic number of an element is defined as the number of protons in the nucleus of an atom. In this case, the...