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What elements is hard and dense has a high melting point and boiling point is fairly reactive and has two electrons in its outermost orbit?
This description matches the element calcium (Ca), which is hard and dense, has a high melting and boiling point, is fairly reactive, and has two electrons in its outermost orbit. Calcium typically forms 2+ cations when it reacts with other elements.
Why are alkali metals and halogens the most reactive families?
Cesium and francium are the most reactive and lithium is the least. Because the reactivity of alkali metals increases going down the group. Down the group: atomic and ionic radii and density increase while melting and boiling points decrease. Therefore it is easy for them to lose the one electron on the outer orbital. So it is very reactive.
How are elements in the last column of the periodic table simliar?
- All are gaseous- All have a low reactivity- All have the outermost shell of electrons completely filled- All have very low melting and boiling points- Excepting argon they are rare gases
What is the boiling point of carbon trioxide?
Carbon trioxide is not a stable chemical compound.
What are the general properties of elements in alkali metals?
Alkali metals are located in Group 1 of the periodic table and include elements like lithium, sodium, and potassium. They are highly reactive metals that easily lose their outermost electron to form ions with a charge of +1. Alkali metals are soft, have low melting and boiling points, and are good conductors of electricity.
What elements is hard and dense has a high melting point and boiling point is fairly reactive and has two electrons in its outermost orbit?
This description matches the element calcium (Ca), which is hard and dense, has a high melting and boiling point, is fairly reactive, and has two electrons in its outermost orbit. Calcium typically forms 2+ cations when it reacts with other elements.
What do elements in group 2 have in common?
Elements in group 2, also known as the alkaline earth metals, have two electrons in their outermost energy level. They are silvery-white, soft metals that are reactive and tend to form 2+ cations. They have relatively low melting and boiling points compared to group 1 elements.
Valence electrons determine an atoms what?
Valence electrons determine an atom’s reactivity and ability to form chemical bonds with other atoms. The number of valence electrons also influences an atom’s physical and chemical properties, such as its melting and boiling points.
What does members of the alkaline earth elements have in common?
Members of the alkaline earth elements have two electrons in their outermost energy level, giving them similar chemical properties. They are all shiny, silvery-white metals that are relatively reactive and form alkaline solutions when they react with water. They are found in group 2 of the periodic table and have similar physical properties such as high melting and boiling points.
What do aklkali metals all have in common?
All alkaline metals are very reactive. this is due to the number of electrons they have in there outer shell. they are situated in the group 1,2 and im not 100% group 6-7. this is because the group determines how many electrons are in the atoms outer shell. so with all atoms trying to get a full outer shell of electrons they will try and loose or gain electrons. so group one and two will quickly try and loose there 1 or 2 outer electrons to get a full outer shell thus making them very reactive and the same with group 6-7 they can not loose there electrons because this would make them positively charged and make it harder for electrons to leave so instead they gain electrons to achieve a full outer shell.
What are the properties and characteristics of the alkali metals and noble gases on the periodic table?
Alkali metals are found in Group 1 of the periodic table and are highly reactive, soft metals that easily lose electrons. They have low melting and boiling points. Noble gases are in Group 18 and are non-reactive, colorless gases with low boiling points. They have full outer electron shells, making them stable and unreactive.
Why are alkali metals and halogens the most reactive families?
Cesium and francium are the most reactive and lithium is the least. Because the reactivity of alkali metals increases going down the group. Down the group: atomic and ionic radii and density increase while melting and boiling points decrease. Therefore it is easy for them to lose the one electron on the outer orbital. So it is very reactive.
How are elements in the last column of the periodic table simliar?
- All are gaseous- All have a low reactivity- All have the outermost shell of electrons completely filled- All have very low melting and boiling points- Excepting argon they are rare gases
What effect does increasing the number of carbons have on the boiling point?
Increasing the number of carbons in a molecule increase the boiling point in the wast majority of cases.
What is the boiling point of carbon trioxide?
Carbon trioxide is not a stable chemical compound.
What are the 5 properties to identify an element?
Atomic number: Number of protons in the nucleus. Atomic mass: Average mass of the element's isotopes. Valence electrons: Number of electrons in the outermost energy level. Electron configuration: Arrangement of electrons in energy levels. Chemical reactivity: How the element interacts with other elements.
What are the general properties of elements in alkali metals?
Alkali metals are located in Group 1 of the periodic table and include elements like lithium, sodium, and potassium. They are highly reactive metals that easily lose their outermost electron to form ions with a charge of +1. Alkali metals are soft, have low melting and boiling points, and are good conductors of electricity.
