The two models below show the same element. Both models show 11 protons (11p) and 11 neutrons (11n) in the nucleus.
Which statement best explains the difference between these two models?
Based on the periodic table, which group of elements would most likely form ions with a +2 charge?
A student observes that elements on the left side of the periodic table are shiny, conduct electricity, and can be hammered into thin sheets. Elements on the right side are dull, do not conduct electricity, and are brittle. Which trend does this observation describe?
If element X is in Group 15 of the periodic table, which property can be predicted about element X?
An unknown element is located in Period 3, Group 16 of the periodic table. Which set of properties would be most likely for this element?
A scientist discovers a new element and determines it is located in Group 13, Period 4 of the periodic table. Based on periodic trends, which prediction about this element's properties compared to aluminum (Group 13, Period 3) would be most accurate?
Which property would help distinguish between an ionic compound and a covalent compound?
A chemist analyzes three compounds with the following properties:
Compound A: Melting point 801°C, conducts electricity when dissolved in water, brittle solid
Compound B: Melting point 1495°C, does not conduct electricity as solid but conducts when molten, brittle solid
Compound C: Melting point 115°C, does not conduct electricity in any state, molecular solid
Which statement best explains the bonding types of these compounds?
What is the correct formula for the ionic compound formed between magnesium (Mg²⁺) and chlorine (Cl⁻)?
A student needs to write the formula for the compound formed between aluminum and oxygen. Aluminum forms Al³⁺ ions and oxygen forms O²⁻ ions. Which formula represents the correct compound with balanced charges?
A scientist analyzes the ionic compounds formed by three different metal-nonmetal combinations and provides the following information:
Metal A (Group 2) combines with Nonmetal X (Group 17) to form Compound 1
Metal B (Group 1) combines with Nonmetal Y (Group 16) to form Compound 2
Metal C (Group 13) combines with Nonmetal Z (Group 15) to form Compound 3
Which set of formulas correctly represents these three compounds?
The two models below show the same element. Both models show 11 protons (11p) and 11 neutrons (11n) in the nucleus.
Which statement best explains the difference between these two models?
The model below shows an atom of an element.
What change would need to be made to this model to represent an isotope of this element?
A scientist analyzes four different particles and records the following data:
Which particles represent the same element, and what is the relationship between particles W and X?
A chemist analyzes the properties of four unknown elements and records the following data:
Based on this data, which statement best predicts the periodic table locations of these elements?
A student tests four unknown compounds and records the following data:
Based on this data, which compounds are most likely ionic?