The electrons in the outermost (valence) shell contribute most to the chemical properties of the element. Since neutrons are uncharged, the number of electrons and therefore the arrangement of electrons in a neutral atom are determined by only the
number of protons that the atom possesses
.
What does number of electrons determine?
The number of electrons in the outermost shell of a particular atom
determines its reactivity, or tendency to form chemical bonds with other atoms
. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
Can you always determine what the element is by the number of electrons?
The number of protons in one atom of an element determines the atom’s identity, and the number of electrons determines its
electrical charge
. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element.
How could you identify an element by its number of protons?
An element’s atomic number is equal to the number of protons in the nuclei of any of its atoms
. The mass number of an atom is the sum of the protons and neutrons in the atom. Isotopes are atoms of the same element (same number of protons) that have different numbers of neutrons in their atomic nuclei.
What determines the identity of an element?
The atomic number is
the number of protons
in the nucleus of an atom
What is the role of electrons within an atom?
Electrons are the subatomic particles that
orbit the nucleus of an atom
. They are generally negative in charge and are much smaller than the nucleus of the atom. … Electrons are also important for the bonding of individual atoms together.
How many electrons are found in a neutral atom of sodium?
We know that the atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has
11 electrons
. The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass).
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 you identify the elements?
There are two properties that can be used to identify an element:
the atomic number or the number of protons in an atom
. The number of neutrons and number of electrons are frequently equal to the number of protons, but can vary depending on the atom in question.
What is the smallest particle of an element?
An atom
is the smallest particle of an element, having the same chemical properties as the bulk element.
What is the most common form of an element?
Hydrogen
is the most common element in the universe. About 91 % of the atoms in the universe are hydrogen atoms. However, they are so light that they make up only 70.6 % of the mass of the universe. Note that the vertical axis in the graph is logarithmic.
How do I know my element name?
The names of elements are
determined from their position on the Periodic Table
. In the modern Periodic Table, the elements are listed in order by increasing atomic number. The atomic number is the number of protons in the nucleus of an atom
Why are electrons The most important part of an atom?
Electrons are also
important for the bonding of individual atoms together
. With out this bonding force between atoms matter would not be able to interact in the many reactions and forms we see every day. This interaction between the outer electron layers of an atom is call atomic bonding
How does an electron move?
Because an electron is a quantum object with wave-like properties, it must always be
vibrating at some frequency
. … Furthermore, an electron in a stable atomic state does not move in the sense of waving through space. The orbital electron does move in the sense of vibrating in time.
What exactly is an electron?
Most of us know that the electron is
a negatively charged particle that orbits the nucleus in an atom of matter
. … Electrons have mass, charge, angular momentum, an intrinsic magnetic moment and helicity, but they have no known substructure. No two electrons can occupy the same space at the same time.
