Respuesta :

Brixbri
Zr



"Zr and because 1s22s22p6., 3s23p63d10, 4s2,4p6,4d2 , 5s2 
so total electrons = 40 so atomic number 40 is of Zr"
Dejanras

Answer is: zirconium (Zr).

Atomic number of zirconium (Zr) is 40, which means it has 40 protons and 40 electrons.

Electron configuration of zirconium atom:

₄₀Zr 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d²5s².

Zirconium has four valence electrons, it is in group 4 and period 5.

Zirconium is a lustrous, grey-white, strong transition metal.

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