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Why is the atomic mass number not a whole number?
We can find Atomic Mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.
What is the relationship btw atomic mass and atomic mass number?
We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.
What is the number on top of an element called?
The Atomic Number
What is the number in front of an element called?
atomic number
Who invented piriodic table?
Dmitri Mendeleev created the first periodic table according to atomic mass in 1869. Others before Mendeleev had organized the elements according to their properties and were able to discern periodicity, although Mendeleev is generally accepted as the creator of the table.With the information he gathered about the elements, he was able to see that there were missing elements that hadn't been discovered. He could figure out the atomic masses of the missing elements by averaging the atomic masses of the elements above and below the missing one. One such element, which he called "eka-silicon" (eventually Ge) was missing, but with understanding of the patterns the periodic table made, he predicted the elements appearance, melting point, atomic mass, density, formula of oxide, and formula of chloride.Throughout the years, other scientists were able to find or create these missing elements to form the table we know today. Today's periodic table is ordered by atomic number instead of atomic mass (as Mendeleev had started). Henry Moseley was the first to order the elements by atomic number so elements would fit together in groups/families and periods better in 1913.
Do radioactive elements differ in atomic number?
yes
What are the radioactive elements with atomic number from 90 to 103 in the periodic table called?
The elements with atomic numbers from 90 to 103 are called actinides. These elements are known for being radioactive and having partially filled 5f orbital. They include well-known elements like uranium, plutonium, and americium.
What are the ten elements in thre periodic table that are radioactive?
all elements after uranium (atomic number 92) are radioactive.
What is the first radioactive element number?
The first radioactive element is polonium, which has the atomic number 84.
Radioactive elements comprise a majority?
Radioactive elements make up a small fraction of all naturally occurring elements in Earth's crust. Most elements are stable and non-radioactive. However, even though they are a minority, radioactive elements play important roles in various scientific, medical, and industrial applications.
What name is given to elements with an atomic number greater than 92?
They are called the trans-uranic elements. They are either synthetic or the rare product of radioactive decay.
What element continue to decay until they finally become stable?
Radioactive isotopes undergo decay by emitting particles and energy until they reach a stable configuration. Elements with unstable nuclei will continue to decay until they transform into a stable isotope through a series of radioactive decay processes.
Which alkaline earth metal is radioactive?
Radium. Elements with an atomic number greater than 83 are always radioactive.
How are the elements with atomic numbers 43 and 61 are unique?
The element with atomic number 43 is technetium, which is the first element on the periodic table that does not have any stable isotopes. Meanwhile, the element with atomic number 61 is promethium, which is one of the rarest and most unstable elements found in nature due to its radioactivity.
Which elements in the peridoic table are radioactive elements?
All elements from atomic number 84 (Polonium - Po) and onwards are radioactive, although ones that have not been observed cannot be confirmed.
What family of metals are all radioactive?
Actinoids, and generally all the elements from polonium (atomic number 84) to ununoctium (atomic number 118).
What does elements with a higher atomic number than uranium have?
Elements with a higher atomic number than uranium belong to the transuranium elements, which are all man-made and generally unstable due to their high atomic numbers. These elements typically undergo radioactive decay, leading to the formation of lighter elements.
