What is the trend within a group of elements?
In chemistry, periodic trends are the tendencies of certain elemental characteristics to increase or decrease as one progresses along a row or column of the periodic table of elements. The atomic radius is one such characteristic that trends across a period and down a group of the periodic table.
What are 4 major trends on the periodic table?
Major trends are electronegativity, ionization energy, electron affinity, atomic radius, and metallic character. The existence of these trends is due to the similarity in atomic structure of the elements in their group families or periods and because of the periodic nature of elements.
What are the major periodic trends?
Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements.
What are group trends?
Group Trend: as you go down a column, ionization energy decreases. Periodic Trend: as you go across a period, ionization energy increases. Ionic Radius Trends. Group Trend: as you go down a column, ionic radius increases. Periodic Trend: as you go across a period, cation and anion radius decreases.
What is the trend as we go down group 1?
Explaining the trend The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.
What is the trend in EA across a period?
Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons.
How many groups are in the periodic table?
18
Groups are numbered from 1 to 18. From left to right in the periodic table, there are two groups (1 and 2) of elements in the s-block, or hydrogen block, of the periodic table; ten groups (3 through 12) in the d-block, or transition block; and six groups (13 through 18) in the p-block, or main block.
What are group 2A elements?
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). They are harder and less reactive than the alkali metals of Group 1A.
What are the properties of group 2 elements?
These physical properties of group 2 elements are:
- low density (mass over volume)
- low melting points (except beryllium)
- low boiling points (except beryllium)
- soft and strong in their metal states.
- ductile.
- malleable.
- shiny and silvery as metals.
- dull appearance.
What is the trend in group 7?
In group 7, the further down the group an element is, the higher its melting point and boiling point . This is because, going down group 7: the molecules become larger. the intermolecular forces become stronger.
What are the trends in group 7 elements?
What are the trends in Group 7 – Halogens? In Group 7, otherwise known as the Halogens, the melting point, boiling point and atomic radius increase as you move down the group. In addition, the reactivity decreases as you move down the group.
