Group
What is the most reactive group (#)?
1
Positive charge
Proton
Identity of the atom
Atomic number
Dmitri Mendelleev
T or F
All atoms on the periodic table are neutral.
T
What it the name of the most reactive group?
Alkali metals
electron
Protons = to ?
Electrons
How many groups?
18
Atoms are mostly ___________.
empty space
Name two elements that belong to the alkali metals:
Li, Na, K, Rb, Cs, Fr
Overall charge of nucleus
+
By changing the number of neutrons an atom forms...
an isotope
The periodic table is _________?
Any constructive response
Electrons in the outermost shell are called,
valence
1, H
What holds atoms together
Opposite charges attract one another
By adding the masses of both protons and neutrons in an atom, it's like saying the mass of the atom is really the _____________?
mass of the nucleus
When p's = e's an atom is called_________?
neutral
An atom that is unstable in its nucleus is usually called,
radioactive
Why are elements in group 1 so reactive?
1 valence electron!
They want to be stable with 8 and thus get rid of this e-.
If the nucleus of an atom were the size of an apple, how many football fields would one have to travel out from the nucleus before encountering the first electron?
5
How many neutrons does the isotope of hydrogen called tritium have?
2 (n) + 1 (p) = 3 amu
By losing an electron and atom becomes....
a positive ion
Which group are alkaline earth metals most likely to give their 2 valence electrons to?
Group 17