What do the rows mean on a periodic table?
Each row represents one period; the period number of an element indicates how many of its energy levels house electrons. Sodium, for instance, sits in the third period, which means a sodium atom typically has electrons in the first three energy levels.
How do you identify the group number and period of an element?
The number of valence electrons in the atom determines the group number of that atom i.e. if an element has 4 valence electrons then it must belong to group IV A. Since sodium has 3 shells, it belongs to period 3.
What does the period number tell us?
The period number on the Periodic table tells you the total number of orbits that the atom will have. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 6th period indicates that these elements possess 6 energy shells.
What is the group number of Na?
Fact box
| Group | 1 | 97.794°C, 208.029°F, 370.944 K |
|---|---|---|
| Atomic number | 11 | 22.990 |
| State at 20°C | Solid | 23Na |
| Electron configuration | [Ne] 3s1 | 7440-23-5 |
| ChemSpider ID | 4514534 | ChemSpider is a free chemical structure database |
What two elements make a laser pen?
Some of the electrical components on the circuit board and the laser diode are made of semiconductor materials, metals, and ceramics. The semiconductor materials include compounds (materials made of more than one pure element) made of aluminum, gallium, arsenic, phosphorus, indium, and similar elements.
What is the chemical name for CL?
Chlorine
What is the name of br2?
Bromine
Is Br2 acidic or basic?
1 Answer. Ralph Pearson classified all Lewis acids and bases as hard and soft acids and bases. Br2 and Br+ are soft Lewis acids and Br- has properties in between soft bases and hard bases. Hence Br2 is considered to be a soft Lewis acid.
What is the Lewis structure of Br2?
The Br2 Lewis structure is similar to F2, Cl2, and I2 since F, Cl, and I are all in Group 7 and have 7 valence electrons. For the Br2 Lewis structure there are a total of 14 valence electrons available. Br2 is sometimes called diatomic Bromine since it is made up of two Bromine atoms.