Quiz 1 prep 2 L1 Attempts of elements classification (2023-2024

1-The transition elements start to appear from the beginning of the .................. period.

• a- second

• b- third

• c- fourth

• d- fifth

2- The scientist ..........................had discovered the main energy levels in the atom.

• a- Moseley

• b- Bohr

• c- Hofmann

• d- Mendeleev

3- The atomic number of an element that is located in period (4) is and group (2A) is.........................

• a-4

• b-18

• c- 12

• d-20

4- Element of d- block are arranged in ................................ groups.

• a- 2

• b- 5

• c- 6

• d- 10

5- The element which occupy the middle block (d ) in the periodic table are called......................... elements.

• a- transition

• b- alkali

• c- alkaline earth

• d- noble

6- Mosely classified elements of each main group into two subgroups ( A and B).

• a- true

• b- false

7- The modern periodic table is classified into 5 blocks .

• a- true

• b- false

8- The atomic number of every element increases by one over the element that precedes it in the same period .

• a- true

• b- false

9- Mendeleev had put more than one element in one place.

• a- true

• b- false

10- The elements which have similar chemical and physical properties are put in horizontal periods.

• a- true

• b- false