Un element Y inconnue appartient a la meme periode que le magnesium (12Mg) et son schema de Lewis est: Y. a) ecrire la configuration electronique de l'atome Mg.
b) identifier l'element Y.
c) un element X appartient a la meme periode que Y et a la meme valence. Identifer X.
d) identifier la nature de la liaison qui pourrait lier (X) et (Y)

Explanation:

hello im only 10 years old and i dont know what dis is but i need points cause i need to finish meh zearn assiment and i have no points ;-; im really sorry for not giveing you the awnser.

the answer would be b i believe

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally