Ques: Q: Free atoms are spherical in shape, so the relative sizes of the elements can be compared by looking at each atom's atomic what? Read this paragraph and choose the correct option from the provided answers: One important characteristic that determines the way in which elements behave is the total size of each atom. Free atoms are spherical in shape, so the relative sizes of the elements can be compared by looking at each atom's atomic radius , which is the distance from an atom's nucleus to the electrons in the outermost orbitals. You might expect atoms to generally grow larger as they go up in atomic number (which is equal to the total number of electrons in the neutral atom). Indeed, if you look at a single group of the periodic table, this trend holds true. Iodine is larger than bromine, which is in turn larger than chlorine and fluorine. In the case of a single group, each successive row places electrons in a higher principal energy level. Since higher energy levels are farther from the nucleus on average, this results in a larger total volume occupied by the atom. Choices: - weight - axis - angles - radius A:
Ans: radius

Ques: Q: An estimated 100 trillion of these live in the gut of an average person? Read this paragraph and choose the correct option from the provided answers: It is estimated that 100 trillion bacteria live in the gut. This is more than the human cells that make up you. It has also been estimated that there are more bacteria in your mouth than people on the planet. There are over 7 billion people on the planet. Choices: - viruses - pathogens - algae - bacteria A:
Ans: bacteria

Ques: Q: An electric transformer connects two circuits with an iron core that becomes what? Read this paragraph and choose the correct option from the provided answers: An electric transformer connects two circuits with an iron core that becomes an electromagnet. Choices: - inductive - radioactive - actuator - electromagnet A:
Ans: electromagnet

Ques: Q: What is the term for the use of two or more lewis structures to represent the covalent bonding in a molecule? Read this paragraph and choose the correct option from the provided answers: Resonance is the use of two or more Lewis structures to represent the covalent bonding in a molecule. One of the valid structures is referred to as a resonance structure. It is now understood that the true structure of a molecule which displays resonance is that of an average or a hybrid of all the resonance structures. In the case of the O 3 molecule, each of the covalent bonds between O atoms is best thought of as being "one and a half" bonds, as opposed to either a pure single bond or a pure double bond. This "half-bond" can be shown as a dotted line in both the Lewis structure and the molecular model (see Figure below ). Choices: - reaction - harmony - frequency - resonance A:
Ans:
resonance