Answer: Option (c) is the correct answer.
Explanation:
Ionic compounds are the compounds formed by transfer of electrons. An ionic compound contains ions which are arranged in an ordered lattice.
This lattice is repeating in nature and thus results in the formation of a compound.
For example, NaCl is an ionic compound that has an ordered crystal lattice.
Thus, we can conclude that the statement they are made up of particles that are arranged in a repeating pattern, is true.
Answer:
To really 'see' inside the atom and detect fundamental particles we need to go beyond visible light and bounce particles off the smallest building blocks of the Universe to 'observe' them. This session introduces students to the scientific process—how scientific methods and theories are updated and develop as new evidence and information is collected.
Explanation:
Until well in the 60ties, the luminous dials of wrist watches and alarm clocks were marked with luminous paints containing Radium (Ra-226) or Promethium (Pm-147). These kind of watches are no longer manufactured today. This is not due to the radiation exposure to the persons wearing the watches but because of the radiological risk for the persons manufacturing them.
Hope this helps
Unlike humans, termites are able to extract energy from wood because: they have some microorganisms living in their gut that are able to break down cellulose.
