Lupe Tanner, Ph. D. The periodic table of the elements places the elements according to
their atomic number, electronic configuration and chemical properties
. Thus, depending on the location of an element in the periodic table, we can guess its electronic configuration and more importantly, its properties.
What are the 3 things that make up the periodic table?
The periodic table is a tabular array of the chemical elements organized by
atomic number
, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.
What is Group 2 elements called?
Group 2A (or IIA) of the periodic table are the
alkaline earth metals
: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
What can you predict about an element?
The periodic table of the elements places the elements according
to their atomic number, electronic configuration and chemical properties
. Thus, depending on the location of an element in the periodic table, we can guess its electronic configuration and more importantly, its properties.
What are two things you can tell about an element based on its location on the periodic table?
Some of the properties of the elements can be predicted given their location in the periodic table. For instance, the
reactivity of atoms is associated with the number of electrons
, and therefore, reactivity of some atoms can be predicted based on their location on the periodic table.
What are 3 facts about elements?
- Elements found on Earth and Mars are exactly the same.
- Hydrogen is the most common element found in the universe. …
- Isotopes are atoms of the same element, with different numbers of neutrons.
- In ancient times the elements referred to fire, earth, water, and air.
Why do we call it periodic table?
Why is the periodic table called the periodic table? It is called the periodic table
because of the way the elements are arranged
. You’ll notice they’re in rows and columns. The horizontal rows (which go from left to right) are called ‘periods’ and the vertical columns (going from up to down) are called ‘groups’.
What are the 20 elements of periodic table?
| Atomic number Name chemical element Symbol | 18 Argon Ar | 19 Potassium K | 20 Calcium Ca | 21 Scandium Sc |
|---|
Why is Group 2 called alkaline earth metals?
Beryllium, magnesium, calcium, strontium, barium and radium are the elements in Group 2. For two reasons, these elements are referred to as Alkaline Earth metals,
Their oxides remain in the crust of the earth and are very heat-stable
. … The elements of Group 2 of the periodic table are alkaline earth metals.
What are the Group 17 elements called?
Halogen
, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
What are the uses of group 2 elements?
- Be is used in the manufacture of alloys. Cu-Be alloys are used in the preparation of high strength springs.
- Mg is used to prepare alloys with Al, Zn, Mn and Sn. …
- Ca is used in the extraction of metals from their oxide.
- Radium salt are used in radiotherapy.
How do you determine which atom is the largest?
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and
francium is the largest
.
Which element has its own family?
Hydrogen
belongs to a family of its own. It’s properties are different from all other elements. However, it’s still in GROUP 1 because it has 1 valence electron.
Is average atomic mass?
The atomic mass of an element is
the average mass of the atoms of an element measured in
atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.
What is the most unique element?
Astatine
is a chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth’s crust, occurring only as the decay product of various heavier elements.
Which is the rarest element on the Earth?
A team of researchers using the ISOLDE nuclear-physics facility at CERN has measured for the first time the so-called electron affinity of the chemical element
astatine
, the rarest naturally occurring element on Earth.
