Chemistry Review

Hannah, Abigail, and Grace are studying for their science exam. They come across a question in their textbook: 'What is an atom's nucleus made of?'

• Protons

• Neutrons

• Electrons

• Nucleotides

During a science class, Mia was asked to identify an element based on its atomic number. She knew that the atomic number is determined by the _________ of ________ in the nucleus. Can you help Mia answer this?

• protons, neutrons

• number, electrons

• electrons, protons

• number, protons

During a science fair, Lily presented a model of an atom and mentioned that it's Molybdenum. Jackson, curious about it, asked what the atomic number of Molybdenum signifies. Lily explained that the atomic number of Molybdenum, which is 42, means that Molybdenum...

• has a freezing point of 42 degrees Fahrenheit.

• belongs to Group 42 on the Periodic Table.

• Can form 42 bonds with other atoms.

• contains 42 protons in its nucleus.

Hannah, James, and Anika are studying chemistry. They are discussing about elements in group 1. What characteristic do these elements share according to their discussion?

• Number of valence electrons 

• Melting point of the element

• Possible number of bonds formed

• Metallic characteristics of the element

1 .) Aria, Scarlett, and Olivia are studying for their chemistry exam. They come across an element where each atom contains 10 protons and 8 valence electrons.

Which statement correctly identifies this element and describes its chemical reactivity?

• A The element is Neon, and it is highly reactive.

• B The element is fluorine, and it is not very reactive.

• C The element is Neon, and it is not very reactive.

• D The element is fluorine, and it is highly reactive.

Tags

NGSS.MS-PS1-1

11.) During a science fair, Michael, Aria, and Grace were discussing the atomic properties of four elements that they had studied. They made a table to record some atomic properties of Boron, Fluorine, Silicon, and Gallium.

Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?

• A Boron is the most reactive because it has the most protons.

• B Fluorine is the most reactive because it has 7 electrons in the outer shell.

• C Silicon is the most reactive because it has an equal number of protons and neutrons.

• D Gallium is the most reactive because it has many more neutrons than protons.

Tags

NGSS.MS-PS1-1

2.) Michael, Anika, and Benjamin are in a science class learning about elements. Their teacher asks, 'Which types of elements have a full outer shell of Valence Electrons, just like a fully packed classroom at the start of the school year?'

• F Metals

• G Noble Gases

• H Metalloids

• J Non-Metals

Abigail, Emma, and Jackson are studying the structure of an atom. They are discussing the characteristics of electrons. Which statement about electrons is NOT true?

• They have a negative charge.

• They have very little mass.

• They are found in the nucleus of an atom.

• They are likely to be found around the nucleus within the electron cloud.

Aiden, Anika, and Abigail are studying the Periodic Table for their chemistry class. They noticed that Letters Y and Z share the same ...

• number of energy levels or orbits

• state of Matter

• number of Valence Electrons

• Chemical Properties

Grace, Liam, and David are studying chemistry. They are discussing about the reactivity of an atom. According to them, what part of an atom is responsible for the atom's chemical reactivity?

• # of electrons

• # of electron energy levels

• # of valence electrons