atomic number 20   (TTS Sound)

The atomic_number_20 has 1 Senses.

• calcium, ca, atomic number 20
• Ｃａ, Ca, カルシウム
• a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
• 明るい炎を上げて燃焼する白色の金属元素