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Who said atoms of the same element are exactly a like?
The statement that atoms of the same element are exactly alike is attributed to John Dalton, who proposed the atomic theory in the early 19th century. Dalton's theory posited that all atoms of a given element are identical in mass and properties, which laid the foundation for modern chemistry. However, it is important to note that later discoveries, such as isotopes, revealed that atoms of the same element can differ in mass due to variations in the number of neutrons.
What is the difference between an atom and element?
Atoms are the building blocks of everything; they are made up of neutrons, protons, and electrons (and recently it has been discovered that these 3 things are made of quarks). Each atom is one piece on its own, floating around and attaching to other atoms.An element is a substance that is made up of only one type of atom. Once the atoms cling to each other they form different substances; if only one type of atom (which means that all atoms have the same number of electrons) is combined then it forms an element. If multiple different atoms cling together it forms other substances.Ex) When atoms with only 1 electron gather they form the element HydrogenWhen atoms with 8 electrons gather they form the element OxygenWhen 2 atoms with only 1 electron cling to one atom with 8 electrons, you end up with 2 Hydrogen atoms that have now mixed with 1 oxygen atom which forms the compound H2O or water; this compound (water) is no longer an element.
Who said that each element is composed of extremely small particles called atoms?
Someone Rutherford.
Who said that all atoms of an element are identical in size mass and other properties?
John Dalton
What is the number protons in the nucleus?
The number of protons in the nucleus is equal to the atomic number of that atom. Said another way, the atomic number of any element is the number of protons in the nucleus of any atom of that element.It might be helpful to consider some examples, and if we look at mercury, we'll see it has an atomic number of 80. All atoms of mercury have 80 protons in them. Aluminum has the atomic number of 13, so all atoms of it have 13 protons in them. Uranium, which has atomic number 92, has 92 protons in all of its atoms.The number of electrons and neutrons in a given atom of a given element can vary for a number of reasons, and these characteristics are considered separately. The number of electrons in any atom will match the number of protons in the nucleus of that atom only if the atom is a neutral one. Some atoms loan out or borrow electrons, and then they become what are called ions. The number of neutrons can vary, too, and we use the term isotope to talk about atoms of a given element having different neutron counts.The atomic number indicates the number of protons in an atom's nucleus.The number of protons in the nucleus is the atomic number of the atom.
When an atoms loses an electron it?
The atom is said to be ionized. (It can also be said to be oxidised.)
What is the difference between elements and atoms?
An atom is the smallest piece of an element. Said another way, and element is made up one and only one kind of atoms.
What is meant by gain or lose electrons?
The electrons surrounding the nucleus of an atom are in fixed 'layers' - with a defined number of electrons in each 'shell'. Stable atoms have a fixed number of electrons in their outer shell. When two atoms combine (to form a molecule) one electron is 'discarded' and the two atoms share a common electron to keep the molecule stable. The electron that's 'discarded' is said to be 'lost'. The electrons are still present - just 'free-floating'. When two atoms split, they 'grab' a free-floating electron to stabilise the molecule again. This electron is said to have been 'gained'.
What is the meaning of the term isotopes?
An isotope is a form of an element. Isotopes (forms of an element) occur when an atom/s of a single chemical element gains or loses 1 or more neutrons. Eg.. the first isotope "Hydrogen-1" or "Protium" hydrogen has 1 proton in the centre of the atom or nucleus, and 1 electron going around on the outside, isotope two "Hydrogen-2" or "Deuterium" Hydrogen, has 1 proton AND 1 neutron in the nucleus and 1 electron, and isotope three is "Tritium" Hydrogen that has 1 proton, 2 neutrons and 1 electron. The number of protons always stays the same, it's the number of neutrons that determines the form of an element or in other words the isotope.
What subatomic particles can differ between neutral atoms of the same element?
Neutral atoms of the same element can differ in the number of neutrons, which results in different isotopes of the same element. Isotopes have the same number of protons and electrons, but different numbers of neutrons.
What two things can be said about atoms belonging to the same element?
All isotopes of the same element have the same atomic number, so their proton numbers are equal.They are on the same (= 'iso') place or spot (= 'topos') in the periodic table, this is called: iso-topic .
Who said atoms of the same element are exactly a like?
The statement that atoms of the same element are exactly alike is attributed to John Dalton, who proposed the atomic theory in the early 19th century. Dalton's theory posited that all atoms of a given element are identical in mass and properties, which laid the foundation for modern chemistry. However, it is important to note that later discoveries, such as isotopes, revealed that atoms of the same element can differ in mass due to variations in the number of neutrons.
What is the difference between an atom and element?
Atoms are the building blocks of everything; they are made up of neutrons, protons, and electrons (and recently it has been discovered that these 3 things are made of quarks). Each atom is one piece on its own, floating around and attaching to other atoms.An element is a substance that is made up of only one type of atom. Once the atoms cling to each other they form different substances; if only one type of atom (which means that all atoms have the same number of electrons) is combined then it forms an element. If multiple different atoms cling together it forms other substances.Ex) When atoms with only 1 electron gather they form the element HydrogenWhen atoms with 8 electrons gather they form the element OxygenWhen 2 atoms with only 1 electron cling to one atom with 8 electrons, you end up with 2 Hydrogen atoms that have now mixed with 1 oxygen atom which forms the compound H2O or water; this compound (water) is no longer an element.
Who said all elements are made of atoms?
An atom is the smallest unit of any element.
What is the atoms electron cloud?
The distribution of electron around an atom in various shells is sometimes referred to as electron cloud. If there are more electrons in certain space around the atom, that space is said to have a denser electron cloud.
What are two elments with the same number of protons but a different number of neutrons called?
Two atoms with the same number of protons are not two elements but one element. If they have differing numbers of neutrons, however, they are said to be of different isotopes.
Who said that each element is composed of extremely small particles called atoms?
Someone Rutherford.
