Based on the general trends in the periodic table, predict which element in each of the following pairs has the smaller atomic radius:

(a) Na or K 

(b) P or N 

(c) Ca or Ni 

(d) Si or S.

Periodic Table:

Transcribed Image Text:

1 IA Li 2 IIA Be Na Mg 3 Ca Rb Sr K H 4 5 IIIB IVB VB Sc 6 7 8 9 10 11 12/ VIB VIIB VIII VI VIII IB IIB Tiv Cr Mn Fe Co Ni Zr Nb Mo Tc Cu Ru Rh Pd Y 18 13 14 IIIA 16 17 VIIIA 15 IVA VA VIA VIIA He с NOF Ne B Al Ga Zn Si P S CI Ge Se As Br Ag Cd In Sn Sb Te Ar Atomic Radius DECREASES Metallic Character DECREASES I Kr Xe 6 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Mc Lv Ts Og 7 Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Am Cm Bk Cf Es Fm Md No Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Lr