The half-life of radioactive Atoms Refers to A. The time required for half the Atoms in a sample to the decay.

B. The number of atoms in a sample that are radioactive.

C. Half the time required for all the Atoms in a sample to disintegrate.

D. The number of atoms that decay in half a second.

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A) the enthralling of formation for pure element in its standard state is always positivehope this : )

Aconductor easily transfer heat

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.