Isotopes are atoms of an element with the normal number of protons and electrons , but different numbers of neutrons. Isotopes have the same atomic number, but different mass numbers. Isotopes can either be radioactive or non-radioactive.
Can an atom have a different number of protons and electrons?
Atoms do not always contain the same number of electrons and protons , although this state is common. When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons).
Can an element have a different number of protons?
All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms . For example, all helium atoms have two protons, and no other elements have atoms with two protons.
Who discovered the electron?
Although J.J. Thomson is credited with the discovery of the electron on the basis of his experiments with cathode rays in 1897, various physicists, including William Crookes, Arthur Schuster, Philipp Lenard, and others, who had also conducted cathode ray experiments claimed that they deserved the credit.
Do protons equal neutrons?
The number of protons in the nucleus of the atom is equal to the atomic number (Z) . ... The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
What element has most neutrons?
Uranium , for example, has the largest naturally occurring nucleus with 92 protons and over 140 neutrons. where, A is the mass number of the element's nuclei, and Z is the atomic number (X stands for the element symbol, for example: H is for hydrogen, O is for oxygen, Na for sodium, etc.)
Can 2 different elements have the same atomic number?
If two atoms have different numbers of protons, they are different elements. ... Two atoms with the same atomic number, but different mass numbers (same number of protons, different number of neutrons), are called isotopes , or isotopic nuclides.
Which two has the same mass number?
The two subatomic particles that have the same mass are protons and neutrons .
Can electrons be created?
An electron can never be created on its own . Or it takes its charge from other particles, or a positron is created at the same time. Likewise, an electron can't be destroyed without another equally, but oppositely, charged particle being created. When the electron is isolated, it can never be destroyed.
Do electrons actually exist?
According to Dirac, at any point in space, the electron neither exists nor doesn't exist . It can only be described as a mathematical function. ... A beam of light or electrons is shot through two parallel slits in a plate. Either photons or electrons go through the two slits and hit a detector screen behind the plate.
Who found Neutron?
In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron. Chadwick was born in1891 in Manchester, England.
What element has 18 protons and 22 neutrons?
| Name Argon | Atomic Mass 39.948 atomic mass units | Number of Protons 18 | Number of Neutrons 22 | Number of Electrons 18 |
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Why are protons not equal neutrons?
Neutrons are the particles in an atom that have a neutral charge. They aren't positive like protons . ... So, if an atom has equal numbers of electrons and protons, the charges cancel each other out and the atom has a neutral charge. You could add a thousand neutrons into the mix and the charge would not change.
Are protons positive?
Protons and Electrons
A proton carries a positive charge (+) and an electron carries a negative charge (-), so the atoms of elements are neutral, all the positive charges canceling out all the negative charges. Atoms differ from one another in the number of protons, neutrons and electrons they contain.
What element has 2 protons neutrons?
Helium is the second element of the periodic table and thus is an atom with two protons in the nucleus. Most Helium atoms have two neutrons in addition to the protons. In its neutral state, Helium has two electrons in orbit about the nucleus. Model of a helium atom's nucleus with two protons and two neutrons.
What element has 51 neutrons?
| Name Zirconium | Atomic Number 40 | Atomic Mass 91.224 atomic mass units | Number of Protons 40 | Number of Neutrons 51 |
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