Question

there are a number of online periodic tables that you can use. one that is particularly useful is called ptable. with ptable you can hover over a class name like \metals\ and see the corresponding elements isolated and highlighted. this is a great way to become familiar with the various classes of elements. for instance, hovering over
onmetal\ isolates this class of elements and highlights them in green. for each of the following elements, indicate how they are classified. hydrogen (h) nonmetal sodium (na) alkaline earth metal calcium (ca) alkali metal copper (cu) alkali metal silicon (si) metalloid carbon (c) nonmetal argon (ar)

Explanation:

Hydrogen is a non - metal as it lacks metallic properties. Sodium is an alkali metal, part of Group 1 in the periodic table. Calcium is an alkaline earth metal, from Group 2. Copper is a transition metal, not an alkali metal. Silicon is a metalloid with properties intermediate between metals and non - metals. Carbon is a non - metal. Argon is a noble gas.

Answer:

Hydrogen (H): Nonmetal
Sodium (Na): Alkali metal
Calcium (Ca): Alkaline earth metal
Copper (Cu): Transition metal
Silicon (Si): Metalloid
Carbon (C): Nonmetal
Argon (Ar): Noble gas