science!
what is the atomic number of hydrogen?
1
what is the atomic mass of sodium?
11
atomic mass of sulfur?
16
atomic mass of helium?
2
how many valence electrons do atoms of elements 3-12 have?
3 or more
what is the name of the element that has the symbol Ca?
Calcium
what is the symbol of iron?
Fe
what is the symbol of hydrogen?
H
the number of the outermost electrons in an atom's electron cloud largely determine an atom's?
chemical properties
what are columns called on the periodic table?
groups
elements are arranged in columns on the period table based of what?
similarities in their chemical properties
within each group on the periodic table, the atoms of each element generally have
the same number of valence electrons
what are the outermost electrons in an atom's electron cloud called?
valence electrons
