Question

1. In the Thomson model of the atom, ___________ are embedded within _____________ charged lumps of matter. However, when Rutherford bombarded gold foil with alpha particles, he discovered that the atom was mostly _______________ , with nearly all the mass concentrated in a central ____________ .

9. When a nucleus emits an alpha particle, the atomic number ["decreases", "increases"] by ["2", "3", "1", "4"] and the mass number ["increases", "decreases"] by ["4", "2", "1", "3"].

10. When a nucleus undergoes beta decay (emitting an electron in the process), the atomic number ["decreases by 1", "remains constant", "increases by 1"] and the mass number ["decreases by 1", "remains constant", "increases by 1"].

Answer 1

1) NEGATIVELY CHARGED ELECTRONS ,    POSITIVELY CHARGED LIMPS OF    MATTER,              EMPTY SPACE ,              WITH POSITIVE CHARGE

9)     ATOMICE NUMER DECREASES BY TWO(2),     MASS NUMBER WILL DECREASE BY FOUR(4)

10)    THE ATOMIC NUMBER INCRASE BY ONE(1),           MASS NUMBER WILL REMAINS CONSTANT