Answer:
Explanation:
The scientist, J. J Thomson interpreted the deflection of the rays by electrically charged plates and magnets as evidence of “bodies much smaller than atoms” (electrons) that he calculated as having a very large value for the charge-to-mass ratio. That is, The masses of their bodies (electrons) was much smaller than the atoms but they had a very large charge to mass ratio.
He then proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model.
Answer:
The feeling of the heart skipping a beat is common
Answer:
1) group
2) period
3) numbers of valence electrons
4) increases
Explanation:
When we move in a periodic table from top to bottom or vice versa along a vertical column , it is said that we are moving along a "group" in a periodic table.
Like wise when we move in a periodic table from left to right or right to left in a horizontal row , it is said that we are moving along a "period" in a periodic table.
The classification of elements belonging to any specific group of periodic table is dependent on the total number of valence electron. All elements of with in a group have same number of valence electrons however, the orbitals may change.
The atomic number increases while moving from left to right as the number of orbitals in which the valence electron is found also increase in the same direction.
A vertical column of elements in the periodic table is called a group
A horizontal row of elements in the periodic table is called a period
Atoms of elements in the same group have the same numbers of valence electrons
As you move from left to right on the periodic table, the atomic number increases
1) group
2) period
3) numbers of valence electrons
4) increases