What element is number 2 on the periodic table?
What element is number 2 on the periodic table?
Helium
The Elements, sorted by Atomic Number
| Atomic Number | Symbol | Name |
|---|---|---|
| 2 | He | Helium |
| 3 | Li | Lithium |
| 4 | Be | Beryllium |
| 5 | B | Boron |
What does 2B mean in the periodic table?
Group 2B is a transition metal. Transition metals can be more strictly defined as an element whose atom or cation has an incomplete d sub-shell. This definition excludes zinc (Zn), cadmium (Cd), mercury (Hg) and probably Uub from the transition elements, as they have full d10 configurations.
What are groups 1 and 2 on the periodic table?
The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
What is number 1 on the periodic table?
Hydrogen
Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on.
What is group A and B in periodic table?
The elements in group IIA are called the alkaline earth metals. The columns with B (IB through VIIIB) are called the transition elements. The columns with A (IA through VIIIA) are called the main group elements. The elements can also be divided into two main groups, the metals and the non-metals.
What do you need to know about chemistry form 2?
Chemistry. Form 2. The Structure of the Atom and the Periodic Table. 1.1 The structure of the atom. When scientists started exploring matter, they realised that matter can be divided into smaller and still smaller particles. They called the smallest particle an ‘atom’. The name ‘atom’ was derived from the Greek word ‘atomos’, meaning ‘indivisible’.
What does 2O 2 mean on the periodic table?
When you have 2O 2 it means two oxygen molecules. The number in front of a formula means, everything following is multiplied by that number. Count again the number of atoms of each element on the reactants and product sides. Insert the correct state symbols for each substance.
Where are the chemical elements on the periodic table?
In the periodic table, chemical elements are present in rows horizontally in order of increasing atomic number and vertically according to the recurring properties of their atoms. Metals are on the left side and non-metal are on the right side of the periodic table
What are the rows called on the periodic table?
In a periodic table, each of the rows is called a period. A column in the periodic table is called a group. The group number also is the number of electrons in the outermost energy level, and the period is also the number of energy levels in the element. The atomic numbers of X, Y and Z are 12, 13 and 17 respectively.
What element is number 2 on the periodic table? Helium The Elements, sorted by Atomic Number Atomic Number Symbol Name 2 He Helium 3 Li Lithium 4 Be Beryllium 5 B Boron What does 2B mean in the periodic table? Group 2B is a transition metal. Transition metals can be more strictly defined as an…