Which of the following elements are known as Lanthanoides 1. Elements from atomic number 51 (Lanthanum) to 70 (Herbium) 2. Elements from atomic number 89 (Actinium) to 102 (Nobelium) 3. Elements from atomic number 11 (Sodium) to 18 (Argon) 4. Elements from atomic number 37 (Rubedium to 54 (Xenon)
Seventh Period is … 1. Small period 2. Long period 3. Incomplete 4. None
Sixth period has 1. 18 elements 2.8 elements 3.32 elements 4. In complete
Fourth and Fifth periods consist of …. elements each 1.2 2.8 3.18 4. 28
Each period in the periodic table ends with an 1. Halogen 2. Chalkogen 3. Inert gas element 4. None of these
All the inert gases are placed in 1. Zero group 2. First group 3. Second group 4. Third group
Based on the electronic configuration, the elements are classified into….. classes 1. Two 2. Three 3. Four 4. Five
Elements from atomic number 89 (Actinium) to 102 (Nobelium) are known as 1. Lanthanoids 2. Actinoids 3. Inertgases 4. Representative elements
According to Newlands concept of actaves if elements are arranged sequentially in the increasing order of their atomic weights 1. Every sixth element is having similar properties 2. Every eighth element is having similar properties 3. Every eighteenth element is having similar properties 4. Every fourth element is having similar properties