Groups and periods are two ways of categorizing elements in the periodic table.
Periods are horizontal rows
(across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
What do groups and periods mean on a periodic table?
The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type.
The horizontal rows are called periods
.
What does group number and period number indicate?
The group number in the periodic table represents
number of valence electrons of the elements in a certain group
.
What does a period number represent?
Electron Shells
As an atom’s atomic number increases, its shells must accommodate an increasing number of electrons. The outermost shell is called the
valence shell
; the period number refers to this shell.
What does group no and period No indicates?
If you are given with the atomic number of an element you can find it’s period number and group number. The period number is related to the number of electron occupied shells in the element and
the period number is linked to its valence electrons
.
What group number is arsenic in?
Arsenic, atomic number 33 lies in between phosphorus and antimony in
group 15
, the so called Nitrogen group of the periodic table.
What are the characteristics of groups and periods?
- Atomic Size: From top to bottom in a group, the size of atom increases as a new shell to the atom.
- Valence Electrons(V.E) : Number of valence electrons in a group are same.
- Valency: All elements in a group generally have the same valency.
What is Period 7 on the periodic table?
The seventh period contains
32 elements
, tied for the most with period 6, beginning with francium and ending with oganesson, the heaviest element currently discovered. As a rule, period 7 elements fill their 7s shells first, then their 5f, 6d, and 7p shells in that order, but there are exceptions, such as uranium.
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 is the difference between short period and long period?
The difference between short period and long period is
based upon the number of elements in each period
. … The shortest period is the first period which contains two elements, while the longest period is the 6
th
period which contains 32 elements.
What is the period number of oxygen?
| Group 16 −218.79°C, −361.82°F, 54.36 K | Period 2 −182.962°C, −297.332°F, 90.188 K | Block p 0.001308 | Atomic number 8 15.999 | State at 20°C Gas 16 O |
|---|
What are 3 uses of arsenic?
Arsenic is a common n-type dopant in semiconductor electronic devices. It is also a component of the III-V compound semiconductor gallium arsenide. Arsenic and its compounds, especially the trioxide, are used in the
production of pesticides, treated wood products, herbicides, and insecticides
.
What does arsenic symbolize?
Description of Arsenic
The Arsenic symbol consists of a narrow, inverted triangle shape, which is placed on top of a line that resembles the inverted shape, but does not connect at the horizontal base. Arsenic is a dangerous poison. It
represents transformation
.
What is the color of arsenic?
Arsenic is a naturally occurring element. In the pure form, it is a
silver-gray, semi-metallic
substance that tarnishes in air. However, arsenic is found in nature in various inorganic and organic compounds. Inorganic and organic arsenic compounds are white in color, and have no smell or special taste.
What are the characteristics of groups?
- Synergy. …
- Common Goals. …
- Shared Norms. …
- Cohesiveness.
