I need a couple of answers for science?

Question

Which elements are liquid at 0C?
At what tempurature are all elements solids?
At 5900c,which element is still a liquid?
Where does the symbol Pb come from?
Which elements had not been discovered by 1980?
Three most reactive elements
Silver has the symbol Ag,where does this come from?

Answer 1

There are two elements that are liquid at the temperature technically designated 'room temperature' or 298 K (25° C) and a total of six elements that can be liquids at actual room temperatures and pressures.

Bromine (symbol Br and atomic number 35) and mercury (symbol Hg and atomic number 80) are both liquids at room temperature. Bromine is a reddish-brown liquid, with a melting point of 265.9 K. Mercury is a toxic shiny silvery metal, with a melting point of 234.32 K.

Francium, cesium, gallium, and rubidium are four elements that melt at temperatures slightly higher than room temperature. Francium (symbol Fr and atomic number 87), a radioactive and reactive metal, melts around 300 K. Francium is the most electropositive of all the elements. Cesium (symbol Cs and atomic number 55), a soft metal that violently reacts with water, melts at 301.59 K. The low melting point and softness of francium and cesium are a consequence of the size of their atoms. In fact, cesium atoms are larger than those of any other element. Gallium (symbol Ga and atomic number 31), a grayish metal, melts at 303.3 K. Gallium can be melted by body temperature, as in a gloved hand. Rubidium (symbol Rb and atomic number 37) is soft, silvery-white reactive metal, with a melting point of 312.46 K. Rubidium spontaneously ignites to form rubidium oxide. Like cesium, rubidium reacts violently with water.

Hydrogen's melting point is -259.14º C

the element with the highest boiling point is Tungsten

Lead is a chemical element in the periodic table that has the symbol Pb (Latin Plumbum) (also the root for plumbing)

Mt Uun Uuu Uub --> http://www.chemicalelements.com/show/dateofdiscovery.html

The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group. Alkali metals can explode if they are exposed to water.

The Alkali Metals are:
Lithium
Sodium
Potassium
Rubidium
Cesium
Francium

Ag - Silver from Latin Argentum

Answer 2

ok, here you are (i hope you get a good mark in social skills, for getting people to do your research):

liquid elements: mercury and bromide

only close to absolute zero (-273,15° C) all elements are solid.

even tungsten has an boiling point of app. 5700° C.
rhenium comes closest with a boiling point of 5870° C.

Pb comes from "plumbum" latin for lead.

all "natural" elements have been found till 1980, only some artificial elements "transuranes" were discovered afterwards, and some are still worked on.
the question would have been much more fun, if the time in question was before 1880 ;-)

most reactive non-metals: fluorine, oxygene, chlorine.
most reactive metals: caesium, rubidium, potassium

Ag comes again from latin "argentum"

ciao

martin m.

ps: all this should have been easy to find in your own books or nearest library, maybe even wikipedia, apart from the "boiling point" thingy.

Answer 3

1) Bromine and mercury
2) -273degC = 0deg K
3) None of them. Rhenium has the highest boiling point of any element, 5630degC
4) Pb = plumbum, from the Latin
5) Fluorine, Oxygen, Cesium
6) Ag = Argentum from the Latin.

Answer 4

OK, since you only need a couple answers:

Pb - This comes from the Latin word for lead, plumbum

Ag - This comes from the Latin word for silver, argentum

Good luck!