鈣
鈣係一種金屬元素，符號Ca，原子序數20，原子重量40.078(4)。鈣質地軟，係灰色嗰。
鈣係地殼上第五多嗰元素，係所有生物必需嗰元素，係動物身上最多嗰金屬。鈣化學上活躍，好多時用來做還原其他金屬。
自然界有六種穩定同位素存在，另外有11種放射性同位素。
| H 氫 | He 氦 | ||||||||||||||||||||||||||||||
| Li 鋰 | Be 鈹 | B 硼 | C 碳 | N 氮 | O 氧 | F 氟 | Ne 氖 | ||||||||||||||||||||||||
| Na 鈉 | Mg 鎂 | Al 鋁 | Si 矽 | P 磷 | S 硫 | Cl 氯 | Ar 氬 | ||||||||||||||||||||||||
| K 鉀 | Ca 鈣 | Sc 鈧 | Ti 鈦 | V 釩 | Cr 鉻 | Mn 錳 | Fe 鐵 | Co 鈷 | Ni 鎳 | Cu 銅 | Zn 鋅 | Ga 鎵 | Ge 鍺 | As 砷 | Se 硒 | Br 溴 | Kr 氪 | ||||||||||||||
| Rb 銣 | Sr 鍶 | Y 釔 | Zr 鋯 | Nb 鈮 | Mo 鉬 | Tc 鎝 | Ru 釕 | Rh 銠 | Pd 鈀 | Ag 銀 | Cd 鎘 | In 銦 | Sn 錫 | Sb 銻 | Te 碲 | I 碘 | Xe 氙 | ||||||||||||||
| Cs 銫 | Ba 鋇 | La 鑭 | Ce 鈰 | Pr 鐠 | Nd 釹 | Pm 鉕 | Sm 釤 | Eu 銪 | Gd 釓 | Tb 鋱 | Dy 鏑 | Ho 鈥 | Er 鉺 | Tm 銩 | Yb 鐿 | Lu 鑥 | Hf 鉿 | Ta 鉭 | W 鎢 | Re 錸 | Os 鋨 | Ir 銥 | Pt 鉑 | Au 金 | Hg 汞 | Tl 鉈 | Pb 鉛 | Bi 鉍 | Po 釙 | At 砹 | Rn 氡 |
| Fr 鈁 | Ra 鐳 | Ac 錒 | Th 釷 | Pa 鏷 | U 鈾 | Np 錼 | Pu 鈽 | Am 鋂 | Cm 鋦 | Bk 錇 | Cf 鉲 | Es 鑀 | Fm 鐨 | Md 鍆 | No 鍩 | Lr 鐒 | Rf 鑪 | Db 𨧀 | Sg 𨭎 | Bh 𨨏 | Hs 𨭆 | Mt 䥑 | Ds 鐽 | Rg 錀 | Cn 鎶 | Nh 鉨 | Fl 鈇 | Mc 鏌 | Lv 鉝 | Ts 鿬 | Og 鿫 |
| 鹼金屬 | 鹼土金屬 | 鑭系元素 | 錒系元素 | 過渡金屬 | 主族金屬 | 類金屬 | 非金屬 | 鹵素 | 稀有氣體 | 化學性質未知 | 預料存在元素 |
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