[单选题]
An atom has 98 protons and 249r .rdq omsnztxm298e* r4 *d9kxrm8,tgwfc1; nucleons. If pxvgh8psh y. 11fmjvq45x)m5 it undergoes alpha decay, what are the number of protons apsjm5)58xgvh.q1hyv 4p x 1fmnd neutrons, respectively, in the daughter nucleus?
