Question

elements: w, sr, h, ti, be, si, fr; periods: period 1, period 2, period 3, period 4, period 5, period 6, period 7 (with reset and help buttons)

Explanation:

Step1: Recall period of each element

• Hydrogen (H): Atomic number 1, period 1.
• Beryllium (Be): Atomic number 4, period 2.
• Silicon (Si): Atomic number 14, period 3.
• Titanium (Ti): Atomic number 22, period 4.
• Strontium (Sr): Atomic number 38, period 5.
• Tungsten (W): Atomic number 74, period 6.
• Francium (Fr): Atomic number 87, period 7.

Step2: Place elements in respective periods

• Period 1: H
• Period 2: Be
• Period 3: Si
• Period 4: Ti
• Period 5: Sr
• Period 6: W
• Period 7: Fr

Answer:

Period 1: H
Period 2: Be
Period 3: Si
Period 4: Ti
Period 5: Sr
Period 6: W
Period 7: Fr