Periodic table Flashcards
Periodic mans elements with…
similar properties occur at regular intervals.
Mendeleev arranged elements in order of…
atomic mass.
Mendeleev sometimes switched…
the order of elements so they fitted in the pattern of other elements.
Mendeleev left…
gaps for undiscovered elements.
In modern periodic table elements are arranged…
in order of atomic number.
Modern periodic table has a group…
0(nobble gases)
Group 1 metals are…
alkali.
Group 1 metals have low…
density.
Group 1 metals melting point…
decreases as you go down.
Group 1 metals are all…
white solids and from colorless solution in water.
Group 1 metals with water produce…
hydrogen gas and hydroxide solution (alkaline).
Hydroxide dissolved in water forms…
alkaline solution.
Group 1 metals as you move down reactivity…
increases.
Group 1 metals reactivity increases because…
electron is further from nucleus and shielded from positive charged nucleus by other electrons. Therefore, it is easier to lose electron.
Group 0 are called…
noble gases.
Group 0 are very un…
reactive elements.
Group 0 elements are stable because
they have a full outer electron shell.
Group 0 the boiling point increases as…
the relative atomic mass increases(down the group)
Group 0 each element has boiling point under…
0.
Group 7 are called…
halogens.
Group 7 boiling point and melting point increases…
as we move down the group.
Group 7 elements from molecules with…
two atoms joined by covalent bond.
Group 7 elements get less reactive as…
we move down the group.
Group 7 why is it harder to get electron with larger atomic mass?
- greater distance from the nucleus
- shielding by internal electrons
More reactive halogen can…
displace a less reactive halogen from and aqueous solution of its salt. (Displacement)
Elements in the same group in the periodic table have the…
the same number of electrons in the outer shell. This gives them similar chemical properties.
How many electrons in the outer electron shell helium has?
2 in the outer shell.
Halide ions have a
single negative charge.
Group 1 metals first 3 elements are…
less dense than water.
