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Handpicking or sand strainers

Explanation:

it is easy to separate sea sand from the shell bits, rocks, and sea animals by handpicking. Filtering, evaporating, and settling can't be used because those methods are used to separate liquid items from solid items, so, magnetism can be a little good method.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.