The atomic number of beryllium (be) is 4, and the atomic number of barium (ba) is 56. which comparison is best supported by this information?

a: they are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties.
b: they are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
c: they are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties.
d: they are in the same group because they have similar atomic masses, but they are in different periods because they have very different atomic numbers.

The answer is:

B)They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.

The explanation:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties.

A period is a horizontal row of elements on the periodic table. For example, the elements sodium ( Na ) and magnesium ( Mg ) are both in period 3. The elements astatine ( At ) and radon ( Rn ) are both in period 6.

they should be similar or the same

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards