B) Each element in the periodic table has a different number of valence electrons.
C) Valence electrons may be lost or gained by an atom when bonding occurs with another atom
D) When atoms collide with other atoms, they bond automatically
Answer: Option (C) is the correct answer.
Explanation:
Electrons present in the outermost shell of an atom are known as valence electrons.
For example, atomic number of calcium is 20 and its electronic configuration is 2, 8, 8, 2. This means that there are 2 valence electrons in a calcium atom.
These valence electrons can be lost or gained by an atom according to the octet rule and ability to gain stability.
Hence, we can conclude that the statement valence electrons may be lost or gained by an atom when bonding occurs with another atom, is True for valence electrons.
Valence electrons may be lost or gained by an atom when bonding occurs with another atom. The correct option is C.
Valence electrons are the electrons in the outermost energy level, also known as the valence shell, of an atom. These electrons are involved in the bonding behavior of atoms, determining how they interact with other atoms to form chemical compounds.
When atoms come into contact and form chemical bonds, valence electrons can be shared, transferred, or rearranged between the atoms.
This process occurs to achieve a more stable electron configuration for each atom involved.
In some cases, atoms may lose valence electrons to become positively charged ions.
This occurs when an atom has fewer valence electrons than the stable, full outer electron shell configuration. These positively charged ions are called cations.
Thus, the correct option is C.
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B; an organized method for doing scientific research
C: the use of science to answer ethical question
D: the application of science to solve practical problems
Meissner's corpuscles
Pacinian corpuscles
free nerve endings
Answer: Free nerve endings
Explanation:
A free nerve ending can be defined as the bare nerve endings that are unspecialized afferent nerve fibers which sends its signal to sensory neuron.
The main function of these nerve endings is to being the signals to the brain from the periphery of the body. They can sense itch, hair movement, temperature, pain et cetera.
It helps the mole eliminate excess heat.
It helps the mole find food.
It helps the mole dig out its burrow.
2. Which of the following do all animals not need to do in order to survive
capture prey.
obtain oxygen.
eliminate waste
avoid predators.
3. How would having a prehensile tail help a treedwelling chameleon?
Its tail would help it grasp branches.
Its tail would help it capture food.
Its tail would help it balance in the treetops.
Its tail would help it maintain homeostasis.
4. Which of the following is an animal waste product?
oxygen
carbon dioxide
water
energy
5. Which of the following must an animal do to survive?
Reproduce.
Breathe air.
Maintain homeostasis.
Dig a burrow